SIP Trunk Setup for E-MetroTel UCX

Use Voyced as an external SIP provider

This guide explains how to connect your Voyced telephone number and SIP trunk to an E-MetroTel UCX telephone system.

E-MetroTel UCX supports third-party SIP providers using standard SIP registration with a username, password and SIP server.

Once configured, your UCX system can make and receive business telephone calls through Voyced.

This manual covers E-MetroTel UCX systems that use the UCX Administration interface, including UCX appliances and supported virtual installations.

The instructions use the built-in IP Trunk Assistant. An alternative manual configuration is included for installations requiring additional SIP settings.

What You'll Need

Before you begin, make sure you have:

• Administrator access to your E-MetroTel UCX system

• A working UCX installation

• At least one configured extension and telephone

• A working internet connection

• Permission to manage SIP trunks and call routing

• An active Voyced telephone number

Your Voyced SIP details:

Replace the example username and password with your actual Voyced service details.

Requirements Before You Begin

Your UCX system must have:

• Correct IP address, subnet mask and default gateway settings

• Working DNS resolution

• Available simultaneous call capacity

• A configured SIP signalling service

• At least one working internal telephone extension

• Suitable firewall and NAT settings

Recommended audio codecs:

• G.711 A-law / PCMA

• G.711 μ-law / PCMU

Voyced expects outgoing telephone numbers in full international format without a leading +.

Example:

442012345678

Calling Traffic

Voyced provides retail-quality telephone services intended for normal business conversations.

Automated bulk calling, predictive dialling and short-burst traffic are not permitted.

Normal incoming calls and individually initiated outbound business conversations are supported.

SIP Trunk Setup Steps

1. Log in to UCX Administration

1. Open your web browser.

2. Enter the administration address of your UCX system.

3. Log in using your administrator credentials.

4. Open the PBX menu.

5. Select IP Trunk Assistant.

The IP Trunk Assistant provides a simplified method for adding external SIP providers.

It supports predefined providers and custom SIP configurations.

For Voyced, use the custom provider option.

2. Create a New Voyced SIP Account

Under PBX → IP Trunk Assistant:

1. Click New Account.

2. Locate Account Settings.

3. Enter the following details.

The Account Name identifies the connection inside UCX.

Use a short name without spaces.

The User Name is your Voyced SIP account number.

The Secret is your Voyced SIP service password.

The Outbound CallerID should be a telephone number authorised for presentation on your Voyced account.

Do not select the predefined E-MetroTel Registration or E-MetroTel IP Auth provider profiles. These are intended for E-MetroTel's own SIP services.

3. Configure the SIP Server

In the Configuration Details section, locate:

Host / IP

Enter:

sip.voyced.eu:5060

The hostname identifies the Voyced SIP server.

Port 5060 is the standard SIP destination port for this connection.

UCX supports a hostname followed by a colon and port number in this field.

Use:

Keep the hostname rather than replacing it with a fixed numerical IP address.

4. Configure the SIP Trunk Parameters

Still under Configuration Details, enter:

These are the important settings for the connection.

Type

Select:

peer

This identifies Voyced as an external SIP provider.

Qualify

Select:

yes

UCX periodically sends SIP OPTIONS requests to check whether the provider is reachable.

Insecure

Enter:

port,invite

This allows incoming SIP INVITE requests from an identified provider peer without requiring each request to contain authentication credentials.

The PBX must still recognise the correct SIP peer.

Context

Enter:

from-trunk

This directs incoming calls into UCX's external-call routing system.

Do not use from-internal for a normal public SIP provider.

Audio Codecs

Set:

Disallow: all
Allow: alaw,ulaw

This enables the recommended G.711 codecs.

DTMF

Select:

rfc2833

This supports telephone keypad signalling for voicemail and IVR menus.

Can Reinvite

Select:

no

This keeps RTP audio routed through UCX during the initial connection.

5. Configure SIP Identity Settings

The IP Trunk Assistant also provides SIP identity settings.

For the initial configuration, use:

The From User field can override the caller ID username in outgoing SIP messages.

Leaving it empty initially allows UCX to use its configured outbound caller ID.

The From Domain identifies the SIP domain:

sip.voyced.eu

If outgoing calls fail because the SIP From username must match your registered account, set From User to your Voyced SIP username and test again.

For normal caller ID presentation, start with the default Remote-Party-ID settings.

Only change these if testing shows that the receiving network requires a different SIP identity header.

6. Save the SIP Trunk

After reviewing the settings:

1. Confirm the server is sip.voyced.eu:5060.

2. Confirm your SIP username.

3. Confirm your service password.

4. Confirm Technology is SIP.

5. Confirm Context is from-trunk.

6. Confirm your codec settings.

7. Click Save.

UCX creates the corresponding SIP trunk automatically.

The new trunk is enabled immediately.

You do not need to open the main PBX Configuration page simply to activate a trunk created through the IP Trunk Assistant.

Your new connection should now appear in the account list.

7. Check the Created SIP Trunk

Navigate to:

PBX → PBX Configuration → Trunks

Find:

Voyced

Open the trunk and review the generated settings.

The configuration should contain your SIP server, username, password and registration information.

For a registration-based SIP provider, UCX must send SIP REGISTER requests.

Check that the trunk contains a valid registration configuration.

If the registration has not been generated correctly, use the manual SIP trunk method described in Steps 8 and 9.

If the IP Trunk Assistant has created the correct configuration, continue to Step 10.

8. Alternative: Create the SIP Trunk Manually

Some UCX installations require additional SIP settings that are not exposed by the IP Trunk Assistant.

In that case, create a SIP trunk directly.

Navigate to:

PBX → PBX Configuration → Trunks

Click:

Add SIP Trunk

Enter:

Under Outgoing Settings, enter:

In PEER Details, enter:

type=peer
host=sip.voyced.eu
port=5060
username=Your-Voyced-DID
secret=YourServicePassword
fromdomain=sip.voyced.eu
context=from-trunk
qualify=yes
insecure=port,invite
canreinvite=no
dtmfmode=rfc2833
disallow=all
allow=alaw
allow=ulaw

Replace the username and password placeholders.

This configuration:

• Identifies the Voyced SIP server.

• Configures username/password authentication.

• Enables G.711 A-law and μ-law.

• Directs incoming calls to the inbound routing system.

• Keeps RTP media routed through UCX.

Leave USER Context and USER Details empty unless your installation uses separate incoming and outgoing SIP peers.

Do not create two active trunks using the same Voyced credentials unless that is part of your intended configuration.

9. Configure Manual SIP Registration

Still on the manual SIP trunk configuration page, locate:

Registration → Register String

Enter:

Your-Voyced-DID:YourServicePassword@sip.voyced.eu/Your-Voyced-DID

Replace the placeholders with your actual SIP account details.

The registration string contains:

• Your SIP username

• Your SIP password

• The Voyced SIP registrar

• Your telephone number as the incoming Contact extension

Example structure:

username:password@registrar/DID

The DID suffix helps Asterisk identify incoming calls associated with the registered telephone number.

Under Incoming Settings, leave:

• USER Context

• USER Details

empty for this standard trunk configuration.

Click Submit Changes.

Then click Apply Config.

The manual SIP trunk is now ready for registration testing.

10. Verify SIP Registration

UCX uses Asterisk for SIP signalling.

For trunks using its traditional SIP driver, you can inspect registration from the Asterisk command-line interface.

Run:

asterisk -rx "sip show registry"

Look for the Voyced account.

Expected result:

Registered

You can also check the configured SIP peers:

asterisk -rx "sip show peers"

If your installation uses PJSIP rather than the traditional SIP driver, use:

asterisk -rx "pjsip show registrations"

Use the command matching the driver configured for your trunk.

A successful registration confirms UCX has authenticated with Voyced.

Incoming and outgoing call routing still need to be configured.

11. Create an Inbound Route

To receive incoming telephone calls through Voyced:

1. Navigate to PBX → PBX Configuration.

2. Select Inbound Routes.

3. Click Add Inbound Route.

4. Enter the route details.

For example:

The DID Number must match the telephone number delivered to UCX.

If the incoming SIP request contains a different format, adjust the DID to match the received value.

Click Submit Changes.

Then click Apply Config.

12. Configure an Inbound Ring Group

If several people should answer incoming calls to the same Voyced number, create a ring group.

Navigate to:

PBX → PBX Configuration → Ring Groups

Enter:

Example:

Select the ringing method required by your organisation.

Click Submit Changes.

Return to:

Inbound Routes → Voyced Incoming

Change Set Destination to:

Ring Groups → Voyced Reception

Save and apply the changes.

Incoming calls will now follow the configured ring group.

13. Configure Additional Incoming Numbers

If several Voyced telephone numbers are delivered through the same SIP account, create an inbound route for each number.

Example:

To add another number:

1. Open Inbound Routes.

2. Click Add Inbound Route.

3. Enter the additional DID.

4. Select its destination.

5. Save.

6. Apply the configuration.

Each DID must match the called number received from Voyced.

When additional telephone numbers use the same SIP account, they can share the existing SIP registration.

14. Configure Incoming DID Identification

UCX normally identifies incoming numbers from the SIP Request-URI.

For this arrangement, the trunk context is:

from-trunk

If incoming calls reach UCX but the DID does not match, inspect the received SIP INVITE.

Some providers place the registered account number in the Request-URI and the actual called DID in the SIP To header.

If your incoming calls use that format, change the trunk context to:

from-pstn-toheader

This tells UCX to obtain the incoming DID from the To header.

For the initial setup, keep:

from-trunk

Only change it if the incoming SIP request confirms that the DID is carried in the To header.

Save any changes and repeat the inbound test.

15. Create an Outbound Route

To place external calls through Voyced:

1. Navigate to PBX → PBX Configuration.

2. Select Outbound Routes.

3. Click Add Route.

4. Enter the route details.

Leaving Route CID empty allows the configured trunk or extension caller ID to be used.

You can enter an authorised number later if you want to use a specific caller ID for this route.

16. Configure Outbound Number Formatting

Scroll to:

Dial Patterns that will use this Route

VoipNow-style number rules do not apply here. UCX uses three separate dial pattern fields:

• Prepend

• Prefix

• Match Pattern

For this example, users dial 9 before the full international telephone number.

Configure:

The Prefix field matches and removes the outside-line access code.

The Match Pattern identifies the remaining number.

For example:

The user dials:

9442012345678

UCX removes the leading 9.

The number sent to Voyced is:

442012345678

This is the expected format.

The Z. pattern is a broad starting example. For production use, apply the destination restrictions required by your organisation.

If users already dial complete international numbers without an access prefix, configure a separate pattern with an empty Prefix field.

Do not add an unnecessary 00 or + to the number sent to Voyced.

17. Select the Voyced Trunk

On the same Outbound Route page, scroll to:

Trunk Sequence for Matched Routes

Select:

Voyced

as the first trunk.

Example:

If your organisation uses another provider as a backup, add that provider only if the intended routing arrangement requires it.

The trunk sequence determines which external connection UCX uses after an outbound route matches.

Click Submit Changes.

Then click Apply Config.

Your outbound route is now configured.

18. Configure Outbound Caller ID

UCX supports outbound caller ID at several levels:

• Extension

• Outbound route

• SIP trunk

For the initial configuration, use your authorised Voyced telephone number.

Open:

PBX → PBX Configuration → Trunks

Select Voyced.

Under:

Outbound Caller ID

Enter:

Your-Voyced-DID

For example:

442012345678

You may also configure the caller ID under individual extension settings.

If you want a particular number to be used for every call on the route, open:

Outbound Routes → Voyced Outbound

Enter the authorised number under Route CID and enable the appropriate override setting.

Check the caller ID precedence before changing working extension-level settings.

Use only telephone numbers authorised for outbound presentation through Voyced.

19. Configure Calling Permissions

UCX can restrict which users may make outgoing calls.

Depending on your installation, these restrictions may use:

• Extension permissions

• Custom Contexts

• Trunk Access restrictions

• PIN Sets

• Outbound route rules

If your organisation already has calling restrictions, confirm that the permitted extensions can use the Voyced route.

For example:

If you use a PIN requirement for international calls, configure the appropriate PIN Set on the outbound route.

Keep existing emergency and special-service routes separate and correctly prioritised.

20. Configure SIP and NAT Settings

Navigate to:

PBX → PBX Configuration → SIP Settings

Review the settings under NAT Settings.

If your UCX system is behind a router performing NAT, configure:

UCX provides an Auto Configure function to detect and populate the external IP address and local networks.

Check the detected values before saving.

Example local network:

192.168.1.0/24

Use your actual network settings.

RTP Settings

UCX commonly uses this RTP range:

UDP 10000–13999

Confirm the actual configured range in your installation.

For an on-premises UCX behind NAT, E-MetroTel documents forwarding the configured RTP port range to the UCX server.

For a normal registration-based SIP trunk, a separate public SIP signalling port-forwarding rule is not normally required.

If your installation also uses IP-authenticated trunks or remote SIP phones, additional signalling access may be needed.

SIP Listening Ports

UCX commonly uses:

The local PJSIP port does not change Voyced's destination port.

The Voyced SIP server remains:

sip.voyced.eu:5060

Disable SIP ALG on your router or firewall if it is enabled.

Save any required changes.

21. Configure Jitter Buffer

If your UCX system uses an internet connection where audio packets occasionally arrive unevenly, the jitter buffer can help.

Navigate to:

PBX → PBX Configuration → SIP Settings

Locate:

Jitter Buffer Settings

For a system receiving SIP calls across the internet, you may enable the jitter buffer.

Start with the default jitter buffer parameters.

Do not increase jitter buffer sizes unnecessarily, as this may introduce additional audio delay.

If your audio quality is already stable, retain the existing settings.

Click Submit Changes, then Apply Config if changes were made.

22. Configure Simultaneous Calls

Your effective simultaneous calling capacity depends on your Voyced service and UCX resources.

For example:

These are examples only.

Use the limits included with your Voyced service.

If your installation needs a trunk-level call limit, configure it using the available trunk or account restrictions supported by your UCX release.

Do not confuse the number of internal extensions with the available simultaneous external calls.

Testing Your Setup

SIP Registration Test

1. Open UCX Administration.

2. Confirm the Voyced SIP trunk is enabled.

3. Check the registration status using the available SIP diagnostics.

For a traditional SIP trunk:

asterisk -rx "sip show registry"

Expected result:

Registered

If the registration fails, review the SIP username, password and registrar hostname.

Inbound Test

1. Call your Voyced telephone number from an external mobile telephone.

2. Confirm UCX receives the call.

3. Check that the correct inbound DID matches.

4. Verify the selected extension, ring group or IVR rings.

5. Answer the call.

6. Check audio in both directions.

For multiple Voyced numbers, test each number separately.

Outbound Test

1. Pick up a telephone registered to UCX.

2. Dial the external access prefix, if configured.

3. Enter the full international telephone number.

4. Confirm the call uses the Voyced trunk.

5. Verify the destination rings.

6. Check two-way audio.

7. Confirm the correct caller ID appears.

Example:

9442012345678

If 9 is your outside-line access code, UCX should send:

442012345678

to Voyced.

Troubleshooting

SIP Registration Fails

Check:

• SIP server is sip.voyced.eu.

• Username is Your-Voyced-DID.

• Password is YourServicePassword.

• The trunk is enabled.

• The registration string is correct.

• DNS resolution works.

• UDP port 5060 is reachable.

If you created the trunk manually, confirm the Register String uses the correct username, password and hostname.

401 or 407 Error

These responses indicate SIP authentication is required.

An initial challenge is normal.

If registration repeatedly fails, check:

• SIP username

• Service password

• Registration string

• Authentication realm

• Subsequent authenticated REGISTER requests

403 Error

Check:

• Account status

• SIP authentication

• Outbound calling permissions

• Caller ID authorisation

• Any account restrictions

404 Error

Check:

• Destination telephone number

• Outbound dial pattern

• Prefix removal

• SIP Request-URI

• Incoming DID matching

• Which system returned the error

For example, if UCX sends the access prefix 9 as part of the destination number, the call may fail.

Correct number sent to Voyced:

442012345678

Incoming Calls Do Not Ring

Check:

• SIP registration

• Trunk context

• Inbound DID Number

• Incoming SIP number format

• Destination configuration

• Extension or ring group availability

If the called number is present in the SIP To header rather than the Request-URI, review whether the trunk needs:

from-pstn-toheader

instead of:

from-trunk

Only change this after inspecting the received SIP request.

Incoming Calls Reach the Wrong Destination

Check:

• Inbound route order

• DID matching

• Catch-all inbound routes

• Time conditions

• Ring group destinations

A catch-all route may accept the call before it reaches the intended DID-specific route if the rules are not configured correctly.

Outbound Calls Fail

Check:

• SIP registration

• Outbound route

• Dial pattern

• Trunk sequence

• Caller ID

• Extension permissions

• Available calling credit

• Simultaneous call capacity

Outbound Calls Use Another Trunk

Open:

PBX → PBX Configuration → Outbound Routes

Check the route order and trunk sequence.

UCX compares the dialled number against available outbound routes.

A different route may match before the Voyced rule.

Review the dial patterns and route priority.

Outbound Number Has the Wrong Format

Check the three dial pattern fields:

For the example using prefix 9:

Confirm that the final number contains only the country code and telephone number.

One-Way Audio

Check:

• SIP Settings NAT configuration

• External IP

• Local Networks

• RTP port forwarding

• Firewall rules

• Codec negotiation

• SIP ALG

The default UCX RTP range is UDP 10000–13999.

Confirm the actual ports configured in your system.

Choppy or Distorted Audio

Check:

• Internet connection quality

• Packet loss

• Jitter

• RTP port handling

• QoS settings

UCX marks voice traffic using DSCP values.

If your internet provider handles these markings incorrectly, review the QoS configuration.

Do not change codec settings before checking basic network quality.

Calls Disconnect After Approximately 30 Seconds

Check:

• SIP acknowledgement delivery

• NAT handling

• Firewall timeouts

• SIP signalling addresses

• Session timers

SIP Trunk Appears Unavailable

If Qualify is enabled, UCX sends SIP OPTIONS requests to check reachability.

A provider may accept registrations and calls without responding to every OPTIONS request as expected.

Check registration and actual calling separately.

If calls work but the trunk is marked unavailable, inspect the OPTIONS responses before changing the connection.

Incorrect Caller ID

Check:

• Trunk Outbound Caller ID

• Route CID

• Extension Outbound CID

• Override Extension

• SIP From and Remote-Party-ID headers

Use an authorised Voyced telephone number.

Registration Works but Calls Still Fail

Successful SIP registration confirms authentication.

It does not guarantee correct call routing.

Test these separately:

1. SIP registration

2. Incoming DID matching

3. Outbound route selection

4. Destination number formatting

5. Caller ID

6. RTP audio

Final Tips

• Keep the SIP server set to sip.voyced.eu.

• Use your Voyced telephone number as the SIP username.

• Use your Voyced service password for authentication.

• Select Custom in the IP Trunk Assistant.

• Configure the connection for SIP registration.

• Use UDP port 5060 for the SIP destination.

• Use from-trunk for normal incoming DID routing.

• Enable G.711 A-law and G.711 μ-law.

• Configure an inbound route for each telephone number.

• Select the Voyced trunk in the appropriate outbound route.

• Remove any outside-line access prefix before sending calls.

• Use full international numbers without a leading +.

• Present an authorised outbound caller ID.

• Check your NAT and RTP settings when required.

• Test registration, incoming calls and outgoing calls separately.

E-MetroTel UCX supports external SIP providers through its IP Trunk Assistant and manual SIP trunk configuration.

With the correct SIP credentials, registration, inbound routes and outbound dial patterns, your UCX system can use Voyced for incoming and outgoing business telephone calls.

Last updated: 27/10/2026

© Voyced
All information provided is copyrighted and purely informative in nature. It is maintained by Voyced with the greatest of care using reliable sources only.
Given the fast evolution of the telecom sector, Voyced does not offer any guarantee about the accuracy and completeness of the information offered. 
We explicitly do not give anyone permission to use this information in any other way than to inform themselves about what (legal) requirements there may be and they need to comply with when registering Services and/or DIDs with Voyced.