IPO Weird Echo Like Issue

[BMB1475]

So this one has me completely stumped.
I have an IP Office 4.2 at one site with a VM Pro which we will call site 1 and another IPO 4.2 at another location which we will call site 2, both tied together via a PTP T1 that is the primary for voice traffic only, site 1 has all the voice service for incoming and outgoing calls so site 2 uses the PTP and an IP trunk to make and receive all it calls, intermittently the customer complains about a call where they hear themselves like an echo but only for the first 15 to 30 seconds of the call and them it disappears and the call is fine, this happens once every week or longer but only on the users end and only on outbound calls....
This only happens at site 2 never at site 1 where the carrier service is and it does not happen with any type of pattern and I am relying on the customer to keep logs of the occurrences so that I can try to log call traffic via monitor.
I am looking for anyone that might have a thought on what they thing this could be and what other the H323 monitoring they think I should use to trace the anomaly...


Brian M Battagliola
Juma Technology Corp.

 

[kwing112000]

What type of phones? is it IP sets. it sounds like a auto gain problem.

Kevin Wing
ACS- Implement IP Office
ACA- Implement IP Office
Carousel Industries

 

[latitude12]

Sounds like there is a lot of echo and it takes the echo canceller a long time to converge. Does the echo occur on calls over the T1 and the IP trunk, or is it isolated to one of them?

If the calls are using IP transport (either via the IP line or an IP handset) the best way to troubleshoot is to take Wireshark traces and extract the audio. If you can take traces of the same call from different points in the network you can work out where the echo is introduced.

Can you record the calls with VM Pro?

 

[BMB1475]

So to answer the first question, yes they are IP phones and I have already tried adjusting the 46xxsettings.TXT just to see if I could mask the issue since it is a intermittent issue but that did not work.
Second, all calls go over the point to point t1 via and IP trunk to the maim site which has all the inbound and outbound carriers services, so if a call is place from site 2 it uses trunks out of Site 1, the issue only occurs on out bound calls not inbound and when it happens it only occurs in the first 15 to 30 seconds of the call only out of Site 2 and never on station to station or station to VM calls.
I can record calls through VM Pro.


Brian M Battagliola
Juma Technology Corp.