[cisco-voip] Call Delays between subscribers in one cluster?

[Lelio Fulgenzi]

We've recently installed a number of new subscribers in our cluster for a wide scale deployment coming up soon. We had some initial problems related to SDL links going down, we've fixed that by setting the Sync Call Forward Database After LinkOOS Advanced-CallManager-SystemParameter to true. We are still experiencing a minor delay (~1sec) from end of dialing to ringback. This delay is definately not there when dialing a phone on the same subscriber. The delay seems to go away if the number has been called recently, but it's not consistent, the delay will resurface quickly sometimes and not others.

Is anyone out there who is using multiple subscribers in a cluster seeing a similar behaviour? We're using MCS7835s linked together with a gigabit backbone and Cat6Ks in the background. The delay is happening even between subscribers that are located on the same network as the publisher, so I can't believe inter-networking delays are causing this.

I've got a case open with the TAC, but wouldn't mind hearing back from anyone who has either seen or not seen this delay with a multiple subscriber deployment. For comparison, we've got the publisher, a seperate dedicated DHCP/TFTP server, and five subscribers (one to be retired soon).

Any comments would be appreciated.

Lelio
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Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
 
"This signature may contain traces of nuts"
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