Best way to implement SIP Options Pings on a SIP Trunk

[SHANE FREESE]

I wanted to see if anyone had suggestions on the best way to configure SIP Options Pings.

Typically I would configure them per dial-peer.  However, I really want to do it per destination IP address.  I do not want a SIP Options ping for every single dial-peer being sent out every X seconds.  

 Example:

In my case I have 4 SIP trunks in the same CUBE.  Each pointing to a different destination IP.  There are 6 dial-peers per SIP trunk.  I really do not want 24 option pings going out every X seconds.  I guess I've never actually did a debug to see how many pings are going out at a time but I am assuming it sends one for each dial-peer or does it?

If I am correct in my assumption, is there way to only send one ping per destination IP and if that single IP goes unresponsive then all 6 dial-peers go down?

[Suresh Subramanian]

Hello,

Out of Dialog Option Ping can only be configured at outbound dial-peers. but In-dialog Option can be enabled  at global level.

Please refer this guide.

http://www.cisco.com/c/en/us/td/docs/ios/voice/cube/configuration/guide/15_0/vb_15_0_Book/vb-gw-sipsip.html#wp1403782

Hope this helps.

//Suresh

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[SHANE FREESE]

Yes, I know all of that.

What I really want to know:

If I have 6 dial-peers all pointing to the same target.  All 6 have the Out of Dialog option ping set.  Does the CUBE send out 6 pings, or just 1?

[Suresh Subramanian · Accepted solution]

Hello,

The OOD option ping is sent per dial-peer to the destination.

Restrictions

•The Cisco Unified Border Element OOD Options ping feature can only be configured at the VoIP Dial-peer level.

•All dial peers start in an active (not busied out) state on a router boot or reboot.

•If a dial-peer has both an outbound proxy and a session target configured, the OOD options ping is sent to the outbound proxy address first.

•Though multiple dial-peers may point to the same SIP server IP address, an independent OOD options ping is sent for each dial-peer.

•If a SIP server is configured as a DNS hostname, OOD Options pings are sent to all the returned addresses until a response is received.

•Configuration for Cisco Unified Border Element OOD and TDM Gateway OOD are different, but can co-exist.

//Suresh

Please rate all the useful posts.

[SHANE FREESE]

Thanks, guess I missed that.

Doesn't that seem terribly inefficient to anyone?  

[Anthony Holloway]

I'll stand behind you on this one for now.  Yes, it seems like IOS should consolidate its OOD OPTIONS PINGs to single host:port combinations, regardless of how many different Dial Peers it exists on.

[SHANE FREESE]

Here is what I propose as a feature request.

Allow multiple sip-server entries under the sip-ua.  Then allow the setting of the options ping per sip-server.  Then if the option ping fails all dial-peers with that sip-server destination would then busy out.

Seems simple enough to me and makes it much more efficient.