SIP Trunk Setup for Alcatel-Lucent OXO Connect / OmniPCX Office

Use Voyced as an external SIP provider

This guide explains how to connect your Voyced telephone number and SIP trunk to an Alcatel-Lucent Enterprise OXO Connect or OmniPCX Office telephone system.

Both systems support third-party SIP providers using standard SIP registration and username/password authentication.

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

This manual covers:

• Alcatel-Lucent OXO Connect

• Alcatel-Lucent OXO Connect Evolution

• Alcatel-Lucent OmniPCX Office R9 and R10

The instructions use the OmniPCX Office Management Console (OMC).

Newer OXO Connect versions have a dedicated SIP configuration section. Older OmniPCX Office systems use the Automatic Routing Selection menus for several of the same settings.

Both methods are explained below.

What You'll Need

Before you begin, make sure you have:

• Administrator or installer access to your Alcatel-Lucent PBX

• The OMC software compatible with your PBX version

• A working network connection with internet access

• At least one configured extension and telephone

• Available IP trunk licences

• Sufficient VoIP resources for your required simultaneous calls

• 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 PBX must have a software release supporting public SIP trunks.

Check the following:

• SIP trunk functionality is licensed and enabled.

• Your PBX has enough available VoIP channels.

• The PBX has a correct IP address, subnet mask and default gateway.

• DNS resolution works.

• UDP SIP signalling can reach the provider.

• The network permits the required RTP audio traffic.

• Existing telephone extensions are working.

Recommended audio codecs:

• G.711 A-law / PCMA

• G.711 μ-law / PCMU

Use full international telephone numbers without a leading + when sending calls to Voyced.

Example:

442012345678

The PBX may use a national or international access prefix when users dial. Its outgoing SIP configuration must convert this into the number format shown above.

Check Your Software Version

The overall procedure is similar, but the SIP gateway and authentication screens are located differently.

SIP Trunk Setup Steps

1. Log in to OMC

1. Open your Alcatel-Lucent OMC application.

2. Connect to your telephone system.

3. Log in using an account with Expert access.

4. Read the current PBX configuration.

5. Save a backup before making changes.

If your OMC interface uses another language, select English under:

Options → Language

This makes the menu names easier to follow.

2. Check Available SIP Trunk Licences

Navigate to:

Hardware and Limits → Software Key Features

Open the Multi-site tab.

Locate:

IP Trunks

Check the number of channels shown as:

Really Activated

For example:

The example system could support two Voyced channels, provided the other required resources are available.

Use the number of channels included in your Voyced service and supported by your PBX.

If no IP trunk licences are available, contact your Alcatel-Lucent installer or authorised partner to activate the necessary licences.

3. Configure Network and DNS

Navigate to:

Hardware and Limits → LAN IP Configuration

Check the network settings.

Example:

Use your actual network details.

The PBX must be able to resolve:

sip.voyced.eu

DNS is configured in the SIP gateway settings later in this guide.

If you change the PBX network settings, a warm restart may be required.

4. Check the Installation Numbering Plan

Navigate to:

Numbering → Installation Numbers

This section controls how your telephone system handles public telephone numbers.

Review:

Example for a UK installation:

The remaining settings depend on your company's telephone numbers and PBX numbering plan.

Do not replace a working numbering plan with these example values.

The international prefix used by telephone users is separate from the number format sent to Voyced.

Save any required changes.

5. Configure Your Public Telephone Numbers

Navigate to:

Numbering → Numbering Plans

Open:

Public Numbering Plan

This section maps incoming public telephone numbers to internal extensions.

For example:

The PBX may use a public number prefix together with a shorter DDI range.

For example, if the installation number already contains the common part of your company's telephone numbers, the public numbering plan may only require the remaining digits.

Check your existing numbering plan before adding or changing entries.

Make sure every incoming Voyced number maps to the correct extension or group.

6. Create a New SIP Gateway

For OXO Connect and OXO Connect Evolution, navigate to:

External Lines → SIP → SIP Gateways

Click Create.

This opens:

Gateway Parameters Details

Enter:

For example:

The example index numbers must only be used if they are available.

If another provider already uses these indexes, select unused values.

The SIP Numbers Format Index must correspond to the number formatting configuration created later.

Older OmniPCX Office R9/R10

For older OmniPCX Office installations, navigate to:

Numbering → Automatic Routing Selection → Gateway Parameters

Select an available gateway index.

Enter the Voyced server, registration and authentication settings using the equivalent fields.

On OmniPCX Office R9.2 and later, SIP account credentials are configured separately under SIP Accounts.

The following steps explain the settings used by both interfaces.

7. Configure the SIP Server

For OXO Connect, open:

External Lines → SIP → SIP Gateways

Select your Voyced gateway.

Click Details.

Open the Domain Proxy tab.

Enter:

The main hostname is:

sip.voyced.eu

Use Dynamic IP Type so the PBX resolves the hostname through DNS.

Do not enter a fixed server IP address.

The Outbound Proxy uses the same hostname for this connection.

For older OmniPCX Office versions, enter these values in the equivalent ARS Gateway Parameters fields.

Click Apply or OK.

8. Configure DNS Resolution

For OXO Connect, open the Voyced gateway's DNS tab.

Enter:

DNS A allows the PBX to resolve the configured hostname.

Use DNS servers available from your PBX network.

For example:

192.168.1.1

This is only an example local DNS server.

Do not enter it unless it is correct for your network.

Some provider profiles use DNS SRV records instead of DNS A.

For this configuration, use ordinary hostname resolution through DNS A unless your installation has confirmed SRV records to use.

On older OmniPCX Office systems, the DNS settings appear within ARS Gateway Parameters.

Save the settings.

9. Enable SIP Registration

For OXO Connect, open the Voyced gateway's Registration tab.

Enter:

The Registrar Name identifies the server that handles account registration.

Use:

sip.voyced.eu

The registration expiry is negotiated with the SIP server.

Start with 300 seconds. If the server requires another interval, use the accepted value.

For older OmniPCX Office installations, enable registration in the relevant ARS Gateway Parameters.

Save the configuration.

10. Enter Your Voyced SIP Credentials

OXO Connect and OXO Connect Evolution

Navigate to:

External Lines → SIP → SIP Accounts

Add a new SIP account.

Enter:

For example:

Use your actual Voyced account number and password.

The Gateway Parameters Index must match the SIP gateway you created earlier.

For one standard SIP trunk account, one SIP account entry is normally sufficient.

Older OmniPCX Office R9/R10

Navigate to:

Numbering → Automatic Routing Selection → SIP Accounts

Add the same account details.

The settings are:

• Login

• Password

• Registered Username

• Gateway Parameters Index

Save the account.

11. Configure SIP Public Numbering

The SIP Public Numbering settings determine how telephone numbers are presented to the provider.

This is particularly important for Voyced.

OXO Connect

Navigate to:

External Lines → SIP → SIP Public Numbering

Select the number format index assigned to your Voyced gateway.

Older OmniPCX Office

Navigate to:

Numbering → Automatic Routing Selection → SIP Public Numbering

Select the corresponding index.

Configure the outgoing number format.

These settings should produce international numbers without adding +.

For example:

442012345678

Not:

+442012345678

Incoming Number Format

For incoming calls, the correct format depends on the numbering information received by the PBX.

For the initial configuration, use:

Check incoming number matching during testing.

If the telephone number received by the PBX uses a different format, adjust the incoming settings to match the actual SIP request and your internal numbering plan.

Save the configuration.

12. Configure SIP Media and Audio

For OXO Connect, open:

External Lines → SIP → SIP Gateways

Select Voyced.

Click Details → Media.

Recommended settings:

Use G.711 A-law as the first codec preference.

Enable G.711 μ-law as the alternative where the gateway supports multiple selected codecs.

Disable Direct RTP for the initial configuration so audio remains routed through the PBX.

For older OmniPCX Office versions, the equivalent settings are available through:

Voice Over IP → VoIP Parameters

Save the configuration.

13. Configure SIP Security

For a standard UDP SIP connection, review the gateway's Security settings.

These settings are appropriate for an initial connection using standard unencrypted SIP signalling and RTP.

Do not enable mandatory TLS or SRTP unless the connection has been configured to support them.

If your PBX already uses a secured network or provider-specific security arrangement, retain the settings required by that configuration.

14. Create the VoIP Trunk Access

For OXO Connect, navigate to:

External Lines → List of Accesses

Click:

Add VoIP

Create the Voyced trunk access.

Example:

Two channels are shown as an example.

Use the actual number supported by your licences and Voyced service.

The SIP gateway must be the gateway configured earlier.

Save the trunk access.

Older OmniPCX Office systems also use External Lines → List of Accesses for their VoIP trunk resources.

15. Assign the Trunk to a Trunk Group

Navigate to:

External Lines → List of Trunk Groups

Open the trunk group configuration.

You may add the Voyced trunk to:

• Your existing main trunk group

• A separate secondary trunk group

For example:

Trunk Group 2 is an example.

If your system already uses this group, select another available group.

A separate group is useful when you want some calls to use Voyced while retaining another telephone provider for different destinations.

Save the trunk group configuration.

16. Create the ARS Trunk Group Entry

The PBX uses Automatic Routing Selection, or ARS, to decide which trunk handles outgoing calls.

Navigate to:

Numbering → Automatic Routing Selection → Trunk Groups Lists

Right-click and select Add.

Create an entry for the Voyced trunk group.

Example:

The Trunk Group must match the group configured in Step 15.

Save the entry.

17. Configure Outbound Call Routing

Navigate to:

Numbering → Automatic Routing Selection → Automatic Routing Prefixes

This section controls which destinations use the Voyced SIP trunk.

Right-click and select Add.

Create the required route.

The available fields include:

• Prefix

• Destination range

• Trunk group list

• Gateway index

• Called-number conversion

• Calling-number handling

Configure the route so calls to the intended destinations use the Voyced gateway and trunk group.

Example: International Calling

Suppose a user dials:

00442012345678

Here, 00 is the international access prefix.

The PBX must convert the number to:

442012345678

before sending the SIP INVITE to Voyced.

If your PBX also uses an internal outside-line access code, that code must be removed as part of the internal numbering and routing process.

For example:

900442012345678

may represent an internal access code 9 followed by the international dialling prefix 00 and destination number.

The final number sent to Voyced must still be:

442012345678

Do not simply remove digits without checking your current numbering plan.

The correct conversion depends on the access codes and international dialling rules already configured on your PBX.

Multiple Providers

If your system uses several telephone providers, configure the ARS table to select the appropriate trunk.

Example:

Preserve the existing emergency and special-service routing.

Save the ARS configuration.

18. Configure Incoming Call Routing

Incoming calls must reach the correct extension or group.

For OXO Connect, review:

External Lines → Incoming Call Handling

You may route incoming calls using the public numbering plan and the selected incoming destination.

The exact arrangement depends on whether your PBX uses:

• Direct inward dialling

• Reception groups

• Call distribution groups

• Automated attendant services

Example: Reception Number

Example: Several Numbers

Ensure the incoming number matches the public numbering plan configured in Step 5.

For older OmniPCX Office installations, the corresponding incoming call handling is configured through the public numbering plan and external line routing.

Save the changes.

19. Configure Outbound Caller ID

The telephone number presented to the called party must be authorised for your Voyced account.

For OXO Connect, review:

Numbering → Installation Numbers

Check the Alternative System CLIP if one is configured.

Also review the relevant subscriber settings.

Navigate to:

Subscribers / Base Stations List

Select the required subscriber.

Open Details and review their external number and calling permissions.

Use your authorised Voyced number.

Example:

Your-Voyced-DID

Where several telephone numbers are associated with your business, you may configure different authorised caller IDs for different extensions.

The SIP gateway's Identity settings determine how caller identity is presented in SIP messages.

For the initial connection, retain the default identity settings unless testing shows that a change is necessary.

20. Configure Calling Permissions

Open:

Traffic Sharing & Barring

Review the calling permissions for the extensions using Voyced.

Check that:

1. The required extensions are allowed to access the selected trunk group.

2. International calling is permitted where needed.

3. Outbound destination restrictions are appropriate.

4. Call forwarding permissions are configured as required.

An extension may be able to make internal calls while being restricted from external calls.

If outgoing calls fail despite successful SIP registration, check these permissions.

21. Configure Firewall and NAT

Your PBX must communicate with:

sip.voyced.eu

Recommended network settings:

If Your PBX Is Behind NAT

For OXO Connect, review the gateway's Topology tab.

The exact settings depend on how your PBX reaches the internet.

If your installation requires explicit public-address handling, configure the appropriate:

• Public IP address

• SIP signalling port

• RTP port range

• Internet-facing network interface

These values must match your real network.

For a system already using a working NAT configuration, retain the existing settings unless testing identifies a problem.

Your firewall must permit the required SIP signalling and RTP audio traffic.

22. Save and Apply the Configuration

After completing the settings:

1. Check the SIP gateway.

2. Confirm your Voyced credentials.

3. Confirm registration is enabled.

4. Review the number formatting.

5. Check the VoIP trunk access.

6. Confirm trunk group assignment.

7. Check incoming and outgoing routes.

8. Save the PBX configuration.

Some OMC changes take effect immediately.

Others may require a warm restart.

Restart the system only when necessary and at a time when active calls will not be disrupted.

Testing Your Setup

Registration Test

Open OMC.

Navigate to:

History and Anomalies → History Table

Look for a successful SIP registration event.

The expected event is similar to:

SIP registration success

If the registration fails, check the SIP gateway and account details.

Inbound Test

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

2. Confirm your PBX receives the call.

3. Check the correct public number matches.

4. Verify the intended extension or group rings.

5. Answer the call.

6. Check two-way audio.

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

Outbound Test

1. Pick up a telephone connected to your PBX.

2. Dial an external telephone number using your normal outside-line access method.

3. Confirm the call routes through the Voyced trunk.

4. Verify the destination rings.

5. Check audio in both directions.

6. Confirm the correct caller ID appears.

Example number sent to Voyced:

442012345678

The final SIP destination must not contain an unnecessary access prefix or leading +.

Troubleshooting

SIP Registration Fails

Check:

• SIP server is sip.voyced.eu

• Registration Requested is enabled

• Registrar Name is correct

• Registrar Port is 5060

• Login is your Voyced SIP username

• Registered Username is correct

• Password is correct

• Gateway Parameters Index matches the correct gateway

• DNS resolution works

Open the History Table to review registration events.

401 or 407 Error

These responses indicate an authentication challenge.

An initial challenge is normal.

If authentication repeatedly fails, check:

• SIP Login

• Registered Username

• Service password

• Authentication realm

• Subsequent authenticated REGISTER requests

403 Error

Check:

• Account status

• SIP authentication

• Calling permissions

• Caller ID authorisation

• Any account restrictions

404 Error

Check:

• Destination telephone number

• SIP number format

• ARS routing

• Called-number conversion

• Incoming DDI matching

• Which system returned the error

For example, if an outgoing number contains 00 when Voyced expects the country code directly, review the ARS conversion settings.

Incoming Calls Do Not Ring

Check:

• SIP registration

• SIP gateway selection

• Public Numbering Plan

• Incoming Call Handling

• Called-number format

• Destination extension or group

• Calling permissions

If the SIP INVITE reaches the PBX but no destination matches, inspect the called telephone number received in the SIP request.

Compare it with your public numbering plan.

Outbound Calls Fail

Check:

• SIP registration

• VoIP trunk access

• Trunk group assignment

• ARS trunk group list

• ARS prefixes

• Number formatting

• Calling permissions

• Caller ID

• Account credit

• Simultaneous call capacity

Outbound Number Has the Wrong Format

Open:

SIP Public Numbering

Check:

Also review the ARS number conversion.

The final number sent to Voyced should look like:

442012345678

One-Way Audio

Check:

• RTP port configuration

• Firewall settings

• NAT handling

• Public IP address

• Codec negotiation

• SDP media information

• SIP ALG

A successful SIP registration does not guarantee working audio.

Calls Disconnect After Approximately 30 Seconds

Check:

• SIP ACK delivery

• NAT handling

• Firewall timeouts

• SIP signalling addresses

• Session timers

Registration Works but Incoming Calls Fail

Check whether incoming SIP requests are recognised as belonging to the Voyced gateway.

Also check the telephone number format received by the PBX.

If the trunk is recognised but the public number does not match, review the incoming SIP number format and Public Numbering Plan.

Registration Works but Outbound Calls Fail

Check:

1. VoIP access is assigned to the correct trunk group.

2. An ARS Trunk Groups List entry exists.

3. ARS prefixes select the Voyced gateway.

4. The destination number is converted correctly.

5. The extension has external calling permission.

Caller ID Is Incorrect

Check:

• Installation Numbers

• Alternative System CLIP

• Subscriber number settings

• SIP Public Numbering

• Gateway Identity settings

Use a telephone number authorised for presentation through your Voyced account.

Reviewing SIP Logs

For OXO Connect, use:

OMC → Tools → Webdiag

The Webdiag tool provides additional diagnostic information.

For registration problems, inspect:

• REGISTER requests

• Authentication challenges

• Registration responses

For calling problems, inspect:

• INVITE

• Request-URI

• From

• To

• SIP response code

• SDP media information

Use SIP traces to determine whether a failed call is caused by authentication, number formatting, routing or media negotiation.

Final Tips

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

• Use your Voyced telephone number as the SIP login and registered username.

• Use your Voyced service password for authentication.

• Confirm sufficient IP trunk licences are available.

• Use Dynamic hostname resolution for the SIP gateway.

• Enable SIP registration.

• Use UDP port 5060 for the SIP destination.

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

• Configure the SIP Public Numbering settings for international numbers without a leading +.

• Assign the SIP gateway to the correct VoIP access and trunk group.

• Configure the ARS routing for outgoing calls.

• Check incoming public number assignments.

• Confirm users have the correct calling permissions.

• Test registration, inbound and outbound calling separately.

Alcatel-Lucent OXO Connect and OmniPCX Office systems support SIP trunk connections using standard registration and authentication.

With the correct SIP gateway, account credentials, number formatting and routing configuration, you can connect your telephone system to Voyced for incoming and outgoing business 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. 
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