Random calls dropping, ghost calls 1

[JordanWitthoft]

Hello

We recently have had an increase in call volume and noticing a lot of calls that are dropping and calls with no audio but show connected. I checked licensing issues and line usage and no issues with that. We have a PRI configured that is connected to an adtran that translates to SIP trunks. The provider says they traced back to adtran and issue appears to be on our side. I re-booted the IPO and the issue was gone for about 5 hours and then slowly came back.

Any thoughts? I have talked with the vendor and provider and they did not have any answers.

Thanks!

 

[aarondyck]

I've seen strange things with Adtran devices in the past, and in almost every scenario it's a problem with the Adtran. Of course, the Adtran vendor always says they've done their trace and it's fine.
I would suggest you have them trace live calls and, when you get a failure, have them check the negotiation. I would guess that either the codec or the payload size is mismatched.

http://www.adventuresinvoip.ca/

 

[JordanWitthoft]

Thanks for reply, in system status I am seeing a round trip delay from line 9(PRI) to the IPO. That does not seem to sync with the issues but going to reboot that adtran.

 

[MTB11645]

Jordan,

I don't see any mention of phone type. You say call volume has picked up. Thought I'd mention you may need a VCM resource for each call to your PRI.

MTB