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
retry invite 2
retry register 10
retry options 1
timers connect 100
registrar dns:sipgw3.orbtalk.co.uk 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.