One way speech after transferred calls

[seahawk04]

Here's the scenario
Call answered by operator at Site A (AACC agent) blind transferred over VTRK to Site B. Site B answers and can hear caller, but originating caller can hot hear Site B (One-way Speech). Both sites are on 7.65

To make matters worse, the problem is intermittent. Site A operators are on 3904 sets the folks on site B are IP. I looked at DSP resources on site A (made test calls from phone in affected loop(s) to phone at far end (IP)but haven't found an issue.

Thoughts on where to look next?

 

[Wanebo]

One way voice path seems to usually be a codec mismatch issue. Do you have an ASM in the middle that you can traces on?

Look at your patch levels on the CS1K's and the sig servers and see if there are any available patches from the Avaya support site. We just went through a round of patching that brought us up current with what ESPL stated was current but had weird almost constant codec negotiations going on after transfers on virtual trunks. Found out there was a new virtual trunking sig server patch that hadn't even been placed on ESPL yet and installing that fixed out problem.

I believe the recommendation from Avaya is to have matching cs1000-vtrk-[version of patch] patches on both sides of the sig servers handling the virtual trunks if possible.

 

[seahawk04]

Wanebo
Thanks for the input, we did just recently have our vendor patch both sites, but I'll have to double check the versions of each Do you happen to know which vtrk patch fixed your issue?

 

[Wanebo]

cs1000-vtrk-7.65.16.23-104.i386.000 – What we were at after our round of patching
cs1000-vtrk-7.65.16.23-121.i386.000 – What Avaya had us move to that fixed our problem

I can't say this patch will fix your issue. You might want to discuss with your business partner and/or Avaya engineers to see what they recommend for your particular setup. My guess is they will recommend doing so, but that is a guess. It seems like every 2 or 3 patching rounds that we go through we find a virtual trunk patch is required on the sig servers before things behave nicely.

 

[seahawk04]

Thanks
I have been down that road before. I will talk to my vendor and have them look into this.

 

[bignose21]

TBH I have had many one way speech problems between CS1K/MPS/Genesys etc. and they are all usually solved with VTRK patchs or in the past also CSP patch on the MGC's. If you are on 7.65 just patch up to the latest hopefully all good. Either way you start there as its the first request from Avaya if you open a case.