SIP Trunk Setup for Ericsson-LG iPECS

Use Voyced as an external SIP provider

This guide explains how to connect your Voyced telephone number and SIP trunk to an Ericsson-LG Enterprise iPECS telephone system.

iPECS supports external SIP providers using standard SIP registration with a username, password and SIP server.

Once configured, you can make and receive business telephone calls through Voyced.

This manual covers:

• iPECS eMG80

• iPECS eMG100

• iPECS eMG800

• iPECS UCP and vUCP

These systems share a similar SIP trunk programming structure.

The instructions use the iPECS Web Administration interface. Menu names may differ slightly between models and software versions.

iPECS Cloud uses a different administration system and is not covered by these instructions.

What You'll Need

Before you begin, make sure you have:

• Administrator access to your iPECS telephone system

• Access to the iPECS Web Administration interface

• A working internet connection

• At least one configured extension and telephone

• Available SIP trunk channels and the required VoIP resources

• Permission to change SIP and call routing settings

• An active Voyced telephone number

Your Voyced SIP details:

Replace the example credentials with your actual Voyced service details.

Requirements Before You Begin

Your iPECS system must have sufficient SIP trunk and VoIP capacity.

Before configuring Voyced, check:

• The PBX supports SIP CO/IP trunks.

• Enough VoIP channels are available.

• The required SIP trunk resources are configured.

• Your PBX has a working IP address and default gateway.

• DNS resolution is available.

• The network permits SIP and RTP traffic.

• Your internal extensions can already make calls.

Recommended audio codecs:

• G.711 A-law / PCMA

• G.711 μ-law / PCMU

Use full international telephone numbers without a leading +.

Example:

442012345678

If your existing telephone system uses an outside-line access code, its outgoing routing must remove that code before sending calls to Voyced.

SIP Trunk Setup Steps

1. Log in to iPECS Web Administration

1. Open your web browser.

2. Enter your iPECS system's administration address.

3. Log in using your administrator credentials.

4. Open Web Admin.

5. Select Administration.

The left-hand menu contains programming sections such as:

• System ID & Numbering Plans

• Station Data

• CO Line Data

• SIP Data

• Tables Data

Before making changes, save a backup of your current PBX configuration using the available maintenance or backup functions.

2. Check Your Available SIP Channels

iPECS uses CO/IP channels for external telephone connections.

To review the available channels:

1. Navigate to CO Line Data.

2. Open Common Attributes (140).

3. Locate the channels you intend to use for Voyced.

For example, if two channels are available, you might assign:

These are example channel numbers.

Use the actual available channels on your system.

If you already use another SIP provider, do not change its assigned channels.

Confirm that the required VoIP resources are available for the number of simultaneous calls your Voyced service supports.

Virtual SIP Channels

Some iPECS installations support virtual registration of SIP trunk channels.

In the device registration settings, a virtual SIP trunk uses:

Only create additional virtual ports if they are required and supported by your installed system.

3. Configure the CO/IP Channels

Open:

CO Line Data → Common Attributes (140)

Select your Voyced CO/IP channel range.

Configure the appropriate external line settings.

For example, you may use CO/IP Group 2 if that group is available.

Do not assume a particular group number is unused.

Next, open:

CO Line Data → VoIP Attributes (141)

Locate CO VoIP Mode.

Select:

SIP

This tells iPECS to use SIP for the selected VoIP channels.

Save the configuration.

4. Configure DNS Resolution

The PBX must resolve the Voyced SIP server:

sip.voyced.eu

Navigate to:

SIP Data → SIP Common Attributes (210)

Locate the DNS settings.

Enter:

Use the DNS servers configured for your network.

If DNS is already working correctly, retain the existing settings.

Changing the DNS configuration on some iPECS versions requires a system restart.

Save the settings and apply any restart required by your PBX.

5. Configure the Voyced SIP Server

Navigate to:

SIP Data → SIP CO Attributes (133)

Enter the CO/IP channel range assigned to Voyced.

Click Load.

Configure:

The SIP server address must be:

sip.voyced.eu

The Normal soft switch type provides the standard SIP configuration.

The Use Outbound Proxy setting directs SIP requests through the configured proxy server.

The connection mode should be UDP.

Start with a registration interval of 3600 seconds. The actual interval must be accepted by the SIP registrar.

Some versions also provide a secondary proxy server section.

Leave the secondary proxy unconfigured for the initial setup.

Click Save.

6. Configure the SIP User ID Range

Remain in:

SIP Data → SIP CO Attributes (133)

Locate:

Registration UID Range

This identifies which SIP User ID entries the selected channels use for registration.

For a single Voyced SIP account, select one unused SIP User ID table entry.

Example:

In this example, index 1 will contain the Voyced account credentials.

If index 1 is already in use, choose another available index and use it consistently.

The same registration may serve several SIP channels belonging to the same Voyced account.

Do not create a separate registration for every simultaneous call channel.

Save the configuration.

7. Enter Your Voyced Credentials

Navigate to:

SIP Data → SIP User ID Attributes (126)

Enter the SIP User ID index selected in Step 6.

Click Load.

Configure:

Registration User ID

This field requires the username and SIP domain.

Example:

442012345678@sip.voyced.eu

Authentication User ID

Enter the SIP username without the domain.

Example:

442012345678

Authentication User Password

Enter your Voyced service password.

User ID Register

Select:

Register

Do not select Provision.

The Register setting tells iPECS to send SIP REGISTER requests to the configured registrar.

The Provision setting is intended for arrangements where the provider delivers calls without SIP registration.

User ID Usage

Set this to:

ON

Click Save.

8. Configure SIP Audio and DTMF

Navigate to:

SIP Data → SIP CO Attributes (133)

Load your Voyced CO/IP channel range.

Locate the codec and DTMF settings.

Recommended configuration:

If your software exposes five codec priority fields, configure the first two as shown and leave unused priorities at None where supported.

RFC2833 provides keypad signalling for IVR menus and voicemail.

Also review the SIP URI formatting settings.

Where the system offers SIP Method or Telephony Method for the To header, use:

SIP Method

This uses a standard SIP URI rather than a telephone URI that may introduce a leading +.

The exact outgoing number is also affected by your dialling and LCR rules.

Click Save.

9. Configure Outbound Caller ID

Your outgoing calls should present an authorised telephone number.

For the first test, use your Voyced telephone number.

Navigate to:

SIP Data → SIP CO Attributes (133)

Load your Voyced channels.

Find the identity settings.

Relevant options include:

• From ID

• P-Asserted-ID

• SIP User ID Fixed Table Index

For a shared company telephone number, you can select the SIP User ID from the Fixed Table as the From identity.

Example:

This allows the outgoing SIP identity to use the configured Voyced account number.

Different Caller IDs for Extensions

If your business uses several authorised telephone numbers, iPECS can also use an extension's outgoing CLI.

The relevant settings include:

• Station Data → CLI Attributes (113)

• ISDN Line Data → CLIP/COLP Table (201)

• CO Line Data → CID/CPN Attributes (151)

The required combination depends on your existing numbering plan.

For the first connection test, use the registered Voyced telephone number as your outbound caller ID.

After confirming the trunk works, configure any additional authorised caller IDs.

10. Configure Outbound Trunk Selection

Your iPECS system must know which CO/IP group contains the Voyced channels.

Navigate to:

CO Line Data → Common Attributes (140)

Confirm that all intended Voyced channels belong to the selected CO/IP group.

Next, review the external line access configuration.

iPECS commonly allows users to access an outside line by dialling:

9

or by selecting a line group.

The actual access codes depend on your PBX numbering plan.

If your system already uses a working outside-line access code, retain it.

Assign the appropriate Voyced CO/IP group to the relevant outbound routing rules.

11. Configure Least Cost Routing

iPECS uses Least Cost Routing, or LCR, to select external telephone lines and modify outgoing numbers.

Navigate to:

Tables Data

The relevant programming sections are:

LCR Control Attributes

Open:

LCR Control Attributes (220)

Review the existing LCR access mode.

The system supports several modes, including:

• Loop LCR

• Internal LCR

• Direct CO LCR

If your installation already uses Loop LCR, you can assign the Voyced trunk group through the existing routing configuration.

LCR Leading Digit Table

Open:

LCR Leading Digit Table (221)

Create or adjust the entry that matches your intended outgoing destinations.

LCR Digit Modification Table

Open:

LCR Digit Modification Table (222)

Select your Voyced CO/IP group.

Configure the digit modification so the destination reaches Voyced in full international format.

Example:

An internal user dials:

9442012345678

If 9 is your PBX outside-line access code, the number sent through Voyced must be:

442012345678

The outside-line access code must not form part of the external destination.

If your users dial international numbers with a prefix such as 00, configure the appropriate digit modification.

Example:

00442012345678

becomes:

442012345678

Do not remove digits blindly. The correct rule depends on your existing LCR access mode and dialling plan.

Keep emergency and special-service routes unchanged unless the intended new route has been confirmed to support them.

Save the LCR settings.

12. Configure Inbound Call Routing

iPECS supports several methods for handling incoming SIP calls.

The SIP account's Ring Route Type determines how calls are delivered.

Navigate to:

SIP Data → SIP User ID Attributes (126)

Load your Voyced SIP User ID entry.

Locate:

Ring Route Type

Available options include:

• ID Assigned Station

• Ring Assignment

• DID Conversion

• MSN-DID Conversion

For a single Voyced number routed to reception, Ring Assignment is a suitable starting point.

For several telephone numbers with different destinations, use the appropriate DID conversion method.

13. Configure a Single Incoming Number

If all calls to your Voyced number should reach the same extension or group:

1. Open SIP User ID Attributes (126).

2. Select your Voyced SIP User ID index.

3. Set Ring Route Type to Ring Assignment.

4. Save.

Next, navigate to:

CO Line Data → CO/IP Ring Assignment (144)

Select the Voyced channels.

Configure the incoming destination for each operating mode.

Example:

The destination may be an extension or an existing station group, depending on your PBX configuration.

For example, you might direct calls to extension 100.

Save the changes.

This method is suitable when one incoming destination is sufficient.

14. Configure Multiple Incoming Numbers

If your Voyced account has several telephone numbers that require different destinations, use DID-based routing.

Navigate to:

SIP Data → SIP User ID Attributes (126)

Load the Voyced SIP User ID entry.

Configure:

Save the settings.

Next, open:

CO Line Data → DID Service Attributes (145)

For the relevant channels, select the DID conversion method required by your numbering plan.

Then navigate to:

Tables Data → Flexible DID Conversion Table (231)

This table maps incoming DID values to internal destinations.

Example Incoming Destinations

DID Digit Handling

iPECS uses DID digit conversion settings to produce an internal routing index.

Some eMG and UCP firmware versions use two to four digits for this conversion step.

For example, an incoming number may be:

442012345678

You might use an internal routing index such as:

101

to select the reception destination.

The conversion from the received number to that index must be configured correctly.

First confirm the called number presented by the incoming SIP INVITE.

Then select the matching DID conversion method and digit mask supported by your system.

Avoid assuming that the PBX will automatically convert a full international number into the required internal index.

15. Configure the Flexible DID Conversion Table

Open:

Tables Data → Flexible DID Conversion Table (231)

Select the routing index you intend to use.

Configure the destination for each operating mode.

Example:

The table supports destination types such as:

• Station

• Station Group

• Voicemail or announcement

• Other supported PBX destinations

Use the actual destination types and numbers configured on your telephone system.

Repeat for additional DID routing indexes.

For example:

Save the configuration.

Check that every DID conversion produces the intended table index.

16. Configure Extension Calling Permissions

Your internal extensions must be allowed to access the Voyced CO/IP group.

Navigate to:

Station Data

Review the relevant settings:

Open:

CO/IP Group Access (117)

Check that the extensions permitted to use Voyced have access to the correct CO/IP group.

Next, review:

Station COS (116)

Confirm that the relevant users are allowed to place the required external calls.

For example:

The available restrictions depend on your PBX configuration.

Save the settings.

17. Configure Simultaneous Calls

Your available simultaneous calls depend on:

• The Voyced service capacity

• The number of enabled SIP CO/IP channels

• The available VoIP resources

• Any limits configured on your PBX

For example:

Use the actual capacity of your Voyced service.

Do not allocate additional channels unless your PBX and service support them.

18. Configure Firewall and NAT

Your iPECS PBX must communicate with:

sip.voyced.eu

Recommended network settings:

If the PBX operates behind a router performing NAT, check:

1. The PBX's IP address and default gateway.

2. The configured public signalling address, where applicable.

3. RTP port handling.

4. Firewall session timeouts.

5. SIP ALG behaviour.

The RTP port range depends on your installed iPECS model and VoIP resources.

Use the actual configured range rather than assuming a fixed port range applies to every system.

Save any changes.

19. Verify SIP Registration

Navigate to:

SIP Data → SIP Registration Status Overview

This page displays the SIP registration state.

Look for the Voyced SIP User ID.

Expected result:

Registered

You can also open:

SIP Data → SIP Trunk Status Overview

This shows the configured proxy, domain, SIP trunk channels and related connection information.

If registration has not succeeded:

1. Open SIP CO Attributes (133).

2. Confirm the server and domain.

3. Open SIP User ID Attributes (126).

4. Confirm the username and password.

5. Check the Registration User ID includes the SIP domain.

6. Confirm User ID Register is set to Register.

7. Save any corrections.

Where required, use the UnRegister and Register actions on the SIP CO Attributes page to refresh the registration.

Avoid doing this during active calls.

Testing Your Setup

Registration Test

1. Open iPECS Web Admin.

2. Navigate to SIP Data → SIP Registration Status Overview.

3. Locate your Voyced SIP account.

4. Confirm that registration has succeeded.

If registration fails, review the SIP authentication settings.

Inbound Test

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

2. Confirm iPECS receives the call.

3. Check the selected incoming routing method.

4. Verify the correct extension or group rings.

5. Answer the call.

6. Check audio in both directions.

If you have several Voyced numbers, test each one separately.

Outbound Test

1. Pick up a telephone connected to iPECS.

2. Dial an external destination using your normal PBX dialling method.

3. Confirm the call uses the Voyced CO/IP group.

4. Check that the destination rings.

5. Verify two-way audio.

6. Confirm the correct caller ID appears.

Example number sent to Voyced:

442012345678

The number must contain the country code without a leading +.

Troubleshooting

SIP Registration Fails

Check:

• Proxy Server Address is sip.voyced.eu.

• Domain is sip.voyced.eu.

• Connection Mode is UDP.

• Proxy UDP Port is 5060.

• Registration UID Range is correct.

• Registration User ID contains the correct username and domain.

• Authentication User ID is correct.

• Authentication User Password is correct.

• User ID Register is set to Register.

• User ID Usage is ON.

• DNS resolution works.

401 or 407 Error

These responses indicate SIP authentication is required.

An initial challenge is normal.

If authentication repeatedly fails, check:

• Authentication User ID

• Service password

• Registration User ID

• SIP domain

• Authentication realm

403 Error

Check:

• Voyced account status

• SIP authentication

• Outbound calling permissions

• Caller ID authorisation

• Account restrictions

404 Error

Check:

• Destination telephone number

• LCR number modification

• SIP Request-URI

• Incoming DID conversion

• Which system returned the response

Make sure the number sent to Voyced does not contain an unwanted outside-line access code.

Incoming Calls Do Not Ring

Check:

• SIP registration

• Ring Route Type in PGM 126

• CO/IP Ring Assignment in PGM 144

• DID Service Attributes in PGM 145

• Flexible DID Conversion Table in PGM 231

• Receiving extension or group availability

If the PBX receives the SIP INVITE but routes it incorrectly, inspect the received DID digits and the selected conversion method.

Incoming Calls Reach the Wrong Extension

Check the relevant PGM 144 or PGM 231 destination.

Also confirm the active Day, Night or Timed operating mode.

If you use DID conversion, verify that each received number maps to a unique internal routing index.

Outbound Calls Fail

Check:

• SIP registration

• CO/IP Group assignment

• CO VoIP Mode

• LCR configuration

• Extension CO/IP Group Access

• Station Class of Service

• Caller ID

• Account credit

• Available call capacity

Outbound Number Has the Wrong Format

The final number sent to Voyced should look like:

442012345678

Check:

• PGM 220: LCR Control

• PGM 221: Leading Digit Table

• PGM 222: Digit Modification Table

• SIP To-header formatting

Confirm that any outside-line access code or international prefix is handled correctly.

One-Way Audio

Check:

• RTP connectivity

• Firewall rules

• NAT configuration

• VoIP resources

• SDP media addresses

• Codec negotiation

• SIP ALG

Successful SIP registration does not guarantee working RTP audio.

Calls Disconnect After Approximately 30 Seconds

Check:

• SIP ACK delivery

• NAT handling

• Firewall timeouts

• SIP signalling addresses

• Session timers

Incorrect Caller ID

Check:

• From ID in PGM 133

• SIP User ID Fixed Table Index

• CLI Attributes in PGM 113

• CID/CPN Attributes in PGM 151

• CLIP/COLP Table in PGM 201

For the first test, use your registered Voyced telephone number.

Trunk Appears Unavailable

Open:

SIP Data → SIP Trunk Status Overview

Check the proxy, domain and channel information.

Then open:

SIP Data → SIP Registration Status Overview

Confirm that your SIP account is registered.

Registration status and SIP trunk reachability are separate checks.

Registration Works but Calls Still Fail

Test the following separately:

1. SIP registration

2. Inbound call routing

3. Outbound CO/IP group selection

4. 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 authentication username.

• Use your Voyced service password for SIP registration.

• Configure the SIP channels through PGM 133.

• Configure authentication through PGM 126.

• Select Register rather than Provision.

• Use G.711 A-law and G.711 μ-law for audio compatibility.

• Use RFC2833 for keypad signalling.

• Assign the correct CO/IP group for outbound calls.

• Configure LCR to send full international numbers without a leading +.

• Use PGM 144 for simple incoming ring assignments.

• Use DID conversion and PGM 231 when multiple incoming numbers require different destinations.

• Check extension calling permissions.

• Test registration, incoming calls and outgoing calls separately.

Ericsson-LG iPECS eMG and UCP telephone systems support external SIP providers using standard SIP registration and authentication.

With the correct SIP account, CO/IP channel configuration and call routing, your iPECS system can use Voyced for incoming and outgoing business telephone calls.

Last updated: 27/10/2026

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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.