Comments on: PRACK Causes No Ringback between CUCM and Lync https://blogs.perficient.com/2011/11/04/prack-causes-no-ringback-between-cucm-and-lync/ Expert Digital Insights Fri, 31 May 2013 17:20:22 +0000 hourly 1 By: Keenan Crockett https://blogs.perficient.com/2011/11/04/prack-causes-no-ringback-between-cucm-and-lync/#comment-3720 Fri, 31 May 2013 17:20:22 +0000 http://blogs.pointbridge.com/Blogs/Crockett_keenan/Pages/Post.aspx?_ID=13#comment-3720 Hey Matt, are you able to capture a Net Mon or Wireshark trace? Lets see what the signaling is telling us.

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By: Matt https://blogs.perficient.com/2011/11/04/prack-causes-no-ringback-between-cucm-and-lync/#comment-3719 Thu, 16 May 2013 14:09:22 +0000 http://blogs.pointbridge.com/Blogs/Crockett_keenan/Pages/Post.aspx?_ID=13#comment-3719 I am having the same issue. Rings once, then no ring. Any other ideas? I tried the rel1xx disable, did not resolved the issue.

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By: Amr https://blogs.perficient.com/2011/11/04/prack-causes-no-ringback-between-cucm-and-lync/#comment-3718 Mon, 24 Dec 2012 11:27:59 +0000 http://blogs.pointbridge.com/Blogs/Crockett_keenan/Pages/Post.aspx?_ID=13#comment-3718 Hi Dovid,
did you get any update for this issue as I have the same scenario that you have.

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By: Riyas https://blogs.perficient.com/2011/11/04/prack-causes-no-ringback-between-cucm-and-lync/#comment-3717 Sun, 09 Sep 2012 13:01:04 +0000 http://blogs.pointbridge.com/Blogs/Crockett_keenan/Pages/Post.aspx?_ID=13#comment-3717 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.

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By: Dovid https://blogs.perficient.com/2011/11/04/prack-causes-no-ringback-between-cucm-and-lync/#comment-3716 Thu, 06 Sep 2012 13:01:03 +0000 http://blogs.pointbridge.com/Blogs/Crockett_keenan/Pages/Post.aspx?_ID=13#comment-3716 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.

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