Comments on: PRACK Causes No Ringback between CUCM and Lync

By: Keenan Crockett

Keenan Crockett — Fri, 31 May 2013 17:20:22 +0000

Hey Matt, are you able to capture a Net Mon or Wireshark trace? Lets see what the signaling is telling us.

By: Matt

Matt — Thu, 16 May 2013 14:09:22 +0000

I am having the same issue. Rings once, then no ring. Any other ideas? I tried the rel1xx disable, did not resolved the issue.

By: Amr

Amr — Mon, 24 Dec 2012 11:27:59 +0000

Hi Dovid,
did you get any update for this issue as I have the same scenario that you have.

By: Riyas

Riyas — Sun, 09 Sep 2012 13:01:04 +0000

YOu can disable this from the VG if the calls are going through VG using the command rel1xx disable under voice service voip
voice service voip
sip
rel1xx disable
I recently faced an issue with our Cisco VG and Lync integration. No CUCM is coming in the picture.

By: Dovid

Dovid — Thu, 06 Sep 2012 13:01:03 +0000

Hmm, this sounds a lot like what I’m experiencing, but our setup is different
CUCM ————-|
Cisco ISR 2901 — Voice T1 —— Verizon POP
Lync FE+Med —– |
Outside callers hear single ring, then silence until pickup. When we had UM misconfigured, there would be a ring once every 20 seconds or so, when Lync would attempt a non answer transfer, fail, and re-connect to the soft endpoint.
Still working on this.