One Way audio issue

[caknfd]

3 building complex for a city. Trouble only occurs in the Police Dept. building. Phones are 5330’s and 5340’s 3300 MXe MCD 4.0 SP3. User will be on a call and they lose the audio of the outside caller (Outside caller continues to hear Mitel user ) found if the Mitel user places the call on hold and picks it back up they get the audio back. Trouble seems to follow the phone but when we replace the phone it sometimes continues. If we bring the phones to our office the trouble does not occur. We have one user we replace her phone 7 times but now seems OK it’s like there is a rev issue with their environment. The do have Verizon cell phone and their 800mhz Public Safety radio repeaters within in the building. Anyone have this particular audio issue?
Thanks
Craig
714-412-0060

 

[nytalkin]

Any logs indicating jitter? Is this a converged data network?

NO GOOD DEED GOES UNPUNISHED!

 

[IrwinMFletcher]

Unless you are using the IPA you won't see any logs indicating audio problems. I'm assuming a TDM trunk of some sort, not SIP, where the audio will go through the E2T. On the E2T's Tx direction, it takes the signal off the wire and transmits a packet. If it's silence, it doesn't know/care, and will not complain. Since the outside party can hear the internal phone, then the Rx is working fine, and again it wouldn't produce any logs.

The IPA however reports what the phone hears, so it would report a mismatch in the number of Tx'd versus Rx'd packets.

I doubt it's the physical phone since they would all have been using the same firmware load (unless the last set was taken from a newer install). That's something to check, compare the version of the phone that now 'works' with the phones that didn't. While you're at it, the version of the system would help too.

For a call to stop midcall, it's most likely a network issue. So start there. One thing that comes to mind is sequence number rollover. How long do they typically talk before they get the one way audio?

 

[nytalkin]

I assumed it was SIP or IP networking. If true look at session timer in SIP PEER PROFILE. Zero disables session timer.

NO GOOD DEED GOES UNPUNISHED!

 

[caknfd]

Thanks for the replies. The trouble only happens in the one building (all 3 buildings are on the same 3300 which has 2 PRI's)the trouble typically occurs withen 2 min of being on a call. If it was the 3300/E2T I would think it would happen in the other buildings. I haven't tried to duplicate on internal calls but will try that next also going to try and get wireshark to monitor the phone I'm testing to see if that shows anything.