Call fail between IP Phones in the same cluster

Answered Question
Jan 12th, 2010

Hi everyone, I have a cluster of 4 CallManagers Server version 7.1 in Site 1, 1 Publisher and Subscriber 1 and Subscriber 2. I installed a Subscriber 3 in Site 2 over a WAN link with Round Trip Time of 71 ms and 8Mbps of bandwidth. My issue is that, when I have a IP PHONE registrated in Subscriber 1 of Site 1 and try to call a IP PHONE registrated in the Subscriber 3 of Site 2 the call can no be established and i hear a busy tone in both directions but when i try to call from a IP PHONE registrated in Subscriber 2 to an IP PHONE registrated in Subscriber 3 the call is established.

The calling seach space of IP PHONES and the routing call are ok and synchronization of Database of all Servers are good (2).

anyone can help me?

Thank you

Correct Answer by mightyking about 7 years 1 month ago

If the call rings at the Subscriber-3 IP Phone, it means there's no problem with the signaling. For me this sounds like a codec issue. Are you using G.729 over the WAN?

MK

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Jaime Valencia Tue, 01/12/2010 - 18:15

If everything in CSS and partitions looks good then most probably you'll need to look at CUCM SDI and SDL traces to find out if the call signaling is working correctly between the CUCM servers.

This could be an SDL sync issue, a cluster reboot would correct that.

HTH

java

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Correct Answer
mightyking Tue, 01/12/2010 - 21:17

If the call rings at the Subscriber-3 IP Phone, it means there's no problem with the signaling. For me this sounds like a codec issue. Are you using G.729 over the WAN?

MK

Ricardo Saya Wed, 01/13/2010 - 05:44

Hi MK, when the call fail, there is a busy tone immediately, there is not any call rings. We are using G.729 over the WAN but if I registrated an IP Phone of Site 1 in the Subscriber 3 and I try to call an IP Phone of Site 1 too, but registrated in the Subscriber 1, the call use codec G.711 and not works. Why could be the issue?

Thank you

Ricardo Saya Wed, 01/13/2010 - 05:32

Hi Java, we collected traces from CCM with the TAC and saw that an IP Phone was unregistered but it was working fine in its callmanager. It had an inconsistency in the traces files that we don't know how to solve it.

I post the SDI traces.

Thank you

Ricardo

rupam_chakra1983 Wed, 01/13/2010 - 05:43

Is there are different call manager group or only a single group.

I have workked on 7.0 but in that only 3 CUCM can be in a group means 1 Publisher and 2 subscriber.

I think only 3 CUCM can be used for phone registration  in a group other can be used for different functionality .

Can any one confirm if i m not wrong ?

Thanks

mightyking Wed, 01/13/2010 - 08:12

Have you configured regions? If so, make sure you select the appropriate codec(G.729) for both ends.

The recommanded one way delay for Clustering Over the WAN is 40ms. Try to ping the Sub-3 from Sub-1 and Sub-2 and vice versa.

MK

Ricardo Saya Wed, 01/13/2010 - 14:15

Hi MK, yes, we are using regions and codec are correct. For CUCM 7.x the recommanded RTT is 80 ms.

Thank you

Ricardo
btmulgrew Wed, 01/13/2010 - 14:36

Hi - If db replication is ok  try temporarily setting both phones to the same  cucm group / location / region / mrgl and test call, if this works reset phones to register with local cucm (but retain all other settings), if this works your WAN should be ok; so issue is prob cucm location / region / mrgl config.

thks

mightyking Wed, 01/13/2010 - 18:33

That's what I said. 40ms One way delay makes 80ms round trip. Have you tried to ping the Sub-3 from the other Subs?

MK

Ricardo Saya Thu, 01/14/2010 - 04:46

Ok, yes i made ping test from the all servers and i saw the same result of round trip time in 71ms.

Thank you

Ricardo

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