dial-peer season target question - regarding SRV records

[gregwoodson]

In a dial-peer, can the session target support an SRV record, instead of an ip or

a regular DNS entry.  Nothing in the documentaion I've seen, shows anything about

it. 

We want to provide failover, in the case our first voice switch is down, and have the calls

routed to the second switch.

[Julio Cascante]

Hi,

Are you using ISDN, SIP or H323?

Regards,

[gregwoodson]

Sorry, SIP only.

[Julio Cascante]

Take a look at the configuration below:

SIP

---

call fallback icmp-ping

call fallback active

dial-peer voice 1 voip

destination pattern 1000

session target ipv4:10.0.1.1

session protocol sipv2

monitor probe icmp-ping

dial-peer voice 2 voip

destination pattern 1000

session target ipv4:(second server ip address)

session protocol sipv2

monitor probe icmp-ping

preference 1

What this does is that before sending the call signaling it probes for Ip connectivity.

If the server does not respond it will try to reach the server on dial-peer 2 and so on (if you had more dial-peers)

Also take a look at the following link:

http://www.cisco.com/en/US/docs/ios/voice/sip/configuration/guide/sip_cg-multi-registrars.html#wp1054867

[jasonstepp]

I would avoid DNS dependency...this had a very negative effect on recent customer.

PRIx7> 2951x2-SIP Trunk> CCM> 28xx FXS-MGCP or VG224-MGCP> Fax

The customer was experiencing significant delay (6-8min) of CNG tone delivery towards 500+ fax environment. Removed the DNS dependency with 3 SIP dial-peers referencing CCM IP's....CNG tone arrived in less than 10secs. They've been chasing this issue for 1.5yrs...
 

[ADAM CRISP]

Yes Greg. SRV is the default - if you set the dialpeer to use DNS, SRV will be used.