This is a quick post on how to configure a SIP trunk in CME as I have had a few emails now requesting it.

SIP trunk configuration is very simple as you only need to find a SIP Provider and in this example I use a company called OrbTalk (I am based in the UK)

All the configuration is done in SIP-UA under global configuration mode:

credentials username USERNAME password 0 PASSWORD realm orbtalk
authentication username USERNAME password 0 PASSWORD
no remote-party-id
retry invite 2
retry register 10
retry options 1
timers connect 100
registrar expires 1800

You can check the SIP registration status by using this command:

Show Sip-ua register status and it should show the following:

Cisco2901#show sip-ua register status
Line                                                                           peer                    expires(sec)           registered           P-Associ-URI
================================ ========== ============ ========== ============
USERNAME                                                                -1                      38                           yes

What you are looking for is registered = yes.

Although I have an expires of 1800 second Orbtalk have 60 seconds so we always go by the shortest time.

You then need a dial-peer, voice translation-rules and profile and you can start getting calls sent to the SIP provider.


Leave a Reply

Your email address will not be published. Required fields are marked *