Avaya IP Office Transfer out to a cell phone-VM messages slow and hard to understand

[chadphoneguy]

Hello everyone. I've got a really weird issue that been happening with an Avaya IP Office customer of mine.
They had 8.1.56 software version.
They have embedded messaging and are using an Auto Attendant.
They have Comcast PRI for phone service. They changed from a different carrier PRI back in July to Comcast. And the issue their having started happening a few months later.
There is an option in the AA that lets them press a selector code that dials to an outside cell phone for after hours emergencies. If the call isn't answered on the cell phone, the cell phone VM picks up and they can leave a message.
They recently started getting messages on the after hours cell phone that are very slow and sounds like the person talking is having a stroke or is in slow motion talking. It's very hard to understand the messages.
We recreated the SD card and upgraded the version to the latest 8.1 version.
But it still happens.
So we changed the emergency number to a cell phone with a different cell carrier and it didn't happen with the few test messages we left, but since it was our cell phone we couldn't leave it like that for a night or 2 to test. But since it's an intermittent issue, we aren't sure if we've really pinpointed the problem to be the cell carrier.
Or if it's a translation issue between the Comcast PRI and the cell carrier? Since the PRI was changed to a different carrier a few months ago, it makes me think maybe it has something to do with that?
Anyone else had this issue or seen something similar and have any suggestions?
Thank you in advance for your response.

 

[Nortel4Ever]

What would happen if someone actually answered the cell phone instead of letting it go to VM? Would the audio be garbled or clear?

 

[chadphoneguy]

It has never happened when he answers the call.
Only from a VM on his cell phone.
And I should add, he has Verizon for his cell phone service. The other detail that I left out, is that his wife has Verizon too, and if you choose her option in the auto attendant after hours, it does the same thing.
So not sure if it's a Verizon cell carrier issue or if it's a translation issue between Comcast and Verizon.
thank you.

 

[GeosmithUK]

Potentially codec related? Codec mismatch between the voicemail and the PBx.

Might be worth seeing if you can port mirror from the PBx and grab a wireshark trace

ACSS|AIPS|APSS

https://ipoffice.tools

 

[GeosmithUK]

Ignore me, I automatically assumed this was SIP

ACSS|AIPS|APSS

https://ipoffice.tools

 

[chadphoneguy]

Yeah, no not SIP.
PRI. No Problem.

 

[chadphoneguy]

NORTEL4EVER any new response on this thread after I answered that it doesn't happen if he answers the call?
thank you

 

[PrimeABTech]

If you create an after hours station and just send it to voicemail to email, I would be curious to know the call volume. Based on the fact they changed providers I would really think that is the place to start. Good Luck