Failover VoIP to PSTN dial-peer configuration

Unanswered Question
Apr 19th, 2007
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I have a CME with a SIP trunk connected to a PBX that allows 4 digit dialing over the WAN. If the WAN goes down I would like to translate the 4 digit number to the E.164 number and then re-route the calls to the PSTN. If the remote PBX extensions are 5xxx and their DID?s are 1-212-555-5xxx will the following configuration work?

dial-peer voice 1 voip

description SIP trunk to PBX

preference 1

destination-pattern 5...

session protocol sipv2

session target ipv4:

no vad



dial-peer voice 100 pots

description Alternate for 4-digit calls

preference 2

destination-pattern 5...

prefix 1212555

port 1/0

Also will this work with CAC (using call threshold commands)?

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Overall Rating: 4 (1 ratings)
rkandah Thu, 04/19/2007 - 20:05
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  • Cisco Employee,

Hi Mike,

You will need to modify your prefix to:


otherwise the number will go out as 1212555000


mike85719 Thu, 04/19/2007 - 20:45
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Thanks for the help! I see what you mean about changing the prefix

Just curious...could I also fix the dial peer I origianlly posted by adding the command "forward-digits 11"?


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