Create a SIP Register Trunk

A SIP (Session Initiation Protocol) register trunk connects your phone system to an internet telephony service provider (ITSP) by authenticating with a username and password. A trunk is the connection that carries calls between your phone system and your provider; a register trunk logs in to the provider with credentials, much like a phone registers, so the provider knows where to send incoming calls. Use this walkthrough as a general model: the steps and fields apply to any SIP register trunk, regardless of provider.

Example account details

Throughout this guide, assume you have purchased a SIP account from a provider named ABC. Your provider gives you a set of connection details similar to the following:

Setting	Value
Provider domain	abc.provider.com
Protocol	SIP
Registration port	5060
Transport	UDP
Username	254258255
Authentication name	254258255
Password	05JsOmsIS54SYh

Substitute your own provider’s values wherever the example values appear below.

Before you begin

• You have an active SIP account from an ITSP, and the provider has supplied a username and password.
• Your phone system can reach the ITSP over the network.
• Your account has permission to add trunks.

Note

If the Add button under Extension and Trunk > Trunk is greyed out, your account cannot add trunks. Contact your service provider to have the permission granted.

Add the trunk

1. Sign in to the management portal and go to Extension and Trunk > Trunk, then click Add.

2. Under Basic, fill in these fields:

   • Name: A label that helps you recognize the trunk later.
   • Trunk Status: Choose Enabled.
   • Select ITSP Template: Choose General.

3. Under Detailed Configuration, set the trunk type and enter the SIP credentials from your provider:

   • Trunk Type: Choose Register Trunk.
   • Transport: Match the transport your provider uses. In this example, choose UDP.
   • Hostname/IP: The provider’s domain name or IP address. In this example, enter abc.provider.com.
   • Port: The registration port your provider gave you. In this example, enter 5060.
   • Domain: The domain used in the SIP URI of headers such as From and To. In this example, enter abc.provider.com.
   • Username: The username from your provider. In this example, enter 254258255.
   • Password: The password from your provider. In this example, enter 05JsOmsIS54SYh.
   • Authentication Name: The authentication name from your provider. In this example, enter 254258255.

   Caution

   The transport you choose (UDP, TCP, or TLS) must match what your provider expects. If it does not match, the trunk will not register and no calls will pass over it.

   Note

   If your provider did not supply a separate domain, enter the same value you used for Hostname/IP. The authentication name is usually identical to the username.

   Enable Outbound Proxy is optional. When a trunk uses an outbound proxy, every SIP packet for outbound calls placed over that trunk is routed through the proxy server first.

   Note

   Check with your ITSP about whether it supports an outbound proxy, and configure the proxy settings according to the provider’s instructions.

4. Open the DIDs/DDIs tab to assign DID numbers to the trunk. A DID (Direct Inward Dialing, called DDI or Direct Dialing Inward outside North America) is a phone number your provider routes to your system so external callers can reach it. Click Add, then create the numbers you need.

   To add a single DID number:

   1. In the Create Method list, choose Single DID.
   2. Set these fields:
      • DID/DDI: The DID number from your provider.
      • DID/DDI Name: Optional. A name that helps you tell inbound calls apart by DID number. When someone dials this number, the name appears on the called party’s device.

   To add a range of DID numbers:

   1. In the Create Method list, choose DID Range.
   2. Set these fields:
      • DID Range: The first and last numbers in the range.
      • DID/DDI Name: Optional. A name that helps you tell inbound calls apart by DID number. When someone dials a number in the range, the name appears on the called party’s device.

   When finished, click Confirm.

   Tip

   For more detail on DID options, see Configure DID Numbers on a Trunk.

5. Optional. Use the Advanced, Inbound Caller ID Reformatting, Outbound Caller ID, or SIP Headers tabs to adjust additional behavior.

6. Click Save, then Apply.

Confirm registration

Return to Extension and Trunk > Trunk and review the trunk on the list.

When the status shows the registered icon , the trunk has registered with the provider successfully.

For a breakdown of every SIP trunk state, see SIP Trunk status.

Next steps

• To receive calls over this trunk, assign it to one or more inbound routes. See Set up an Inbound Route.
• To place calls over this trunk, assign it to one or more outbound routes. See Set up an Outbound Route.