SIP-UA behaviour on Cisco ISR router

Unanswered Question
Jun 30th, 2007

Is there there a way to get the sip-ua in the ISR to react to, for example 5xx or 4xx responses from returned after and INVITE? i.e. can/will the sip-ua fail-over to an alternate host/target returned in DNS SRV resource record on receipt of a 5xx or 4xx response?

I have this problem too.
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ozmark Fri, 07/06/2007 - 01:11

Not so sure my 28xx would a agree with that statement.

dial-peer voice 1003 pots

destination-pattern 0440003

port 0/0/0:3



nat symmetric check-media-src

no remote-party-id

disable-early-media 180

retry invite 2

retry response 3

retry bye 2

retry cancel 2

retry register 2

registrar ipv4: expires 123

sip-server ipv4:



line con 0

jposada_us Fri, 07/13/2007 - 13:30

Do you mean to have an alternate (secundary) target IP in case the first one fail, I have a configuration to do that but not sure if it's what you are looking for.

Let me know


ozmark Mon, 07/16/2007 - 05:51

I would be interested in this. At least to compare with what I have done today with my DNS SRV approach. Unfortunately I have had a TAC running on this for a little while now and I have finally had confirmation that sip-ua in the ISR will only failover to an alternate target up no response i.e. not on receipt of a 503 meessage for example.



jposada_us Mon, 07/16/2007 - 07:12

Not sure about the SIP message 503, I had done this long time ago and it worked with a 2801 even in the no response from fist ip address. Try this configuration...

ip domain name

ip host

dial-peer voice XX voip

description XXX

destination-pattern 00[1-9].......

session protocol sipv2

session target sip-server

codec g729r8 bytes 30


retry invite 2



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