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How to configure SIP Trunk


We recently have a new SIP circuit from telco with 200 extenstions.

They had given me below details

Customer IP address=

STC IP Address =

Protocol= SIP 

SIP Port = 5060 

Transport Protocol=UDP

Voice Codec= G711 A-Law 

DTMF = IN-Band DTMF with RFC2833 

SIP Server IP address =

The Extensions range is
65291100 – 65291299

I have 2821 router and Call Manager 7.0

Kindly help me to configure it.

Thanks in Advance


Re:How to configure SIP Trunk

Use this guide to configure your dialpeers on your router.

You will also need to add your gateway on cucm.

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Re: How to configure SIP Trunk

Thanks for reply,

Gateway was already added earlier as H323 gateway as we were using FXO ports. Do i need to make any changes to it.

Can we make sip trunk to Telco company on Call Manager.

And how can i translate telephone number to  Internal Extension.

And what dial peer should i be creating on router for call in and out.

I would appreciate if i can get a step by step guide to do this task.

Kindly advice.