[cisco-voip] Forwarded Calls drop after 29 secs

[Joel Perez]

Hey Guys,

Thanks for the responses. The carrier still hasnt gotten back to me yet with
any results.
The carrier is using a Broadsoft platform so I will mention this to them and
have them take a look at it.

Thanks,

Joel P

On Sun, Jan 24, 2010 at 12:10 PM, Mark Holloway <mh at markholloway.com> wrote:

> The issue with 'call drops on forwarded calls' is usually a result of the
> PBX treating the forwarded portion of the call as a totally separate call
> leg from the originating call into the PBX and the PBX is not providing a
> progress indicator to the telco switch for the original call leg until the
> second call leg is answered.  The telco switch will timeout if it doesn't
> receive a progress message and drop the call because there has been no
> acknowledgement to the original call setup.  The reason it may not happen
> 100% of the time is if the forwarded call to the PSTN is setup or answered
> fast enough, the PBX will notify the original call leg know the call has
> been answered or there is ring back.  Depending on the far end carrier your
> are forwarding calls to, it may work in some instances but not others.
>  Proper PBX behavior is when calls are forwarded from the PBX to the PSTN,
> the PBX should provide SIP Diversion or ISDN Progress Indicator on the
> original call leg so the telco switch does not timeout.  Carriers who are
> using Sonus, Broadsoft, Metaswitch, often make static changes in their
> switch to work around this problem, but the PBX is still doing it wrong.
>
>
>
>  On Jan 23, 2010, at 3:20 PM, James Buchanan wrote:
>
>   I had the same issue once. The SIP provider’s provider was killing the
> call at thirty seconds.
>
> James Buchanan, CCIE #25863
> Senior Network Engineer
> Coleman Technologies, Inc.
> 12 Cadillac Drive, Suite 130
> Brentwood, TN 37017
> (615) 866-5729
>
>  *From:* cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Jim Skelton
> *Sent:* Friday, January 22, 2010 2:46 PM
> *To:* Joel Perez
> *Cc:* cisco-voip at puck.nether.net
> *Subject:* Re: [cisco-voip] Forwarded Calls drop after 29 secs
>
>  Hi Joel,  I had a similar issue.  I would see our calls drop after
> exactly 30 seconds.  It turned out to be an issue with our
> carrier TimeWarner telecom and thier Oakland SIP switch.  We repointed to
> thier North Carolina SIP switch and everything cleared up.   TW is running
> Sonus switches.
>
>   Our setup with twtelecom is Carrier---sip---CUBE----h323---CUCM
>
>  Hope this helps.
>
>
>
>  Jim Skelton
>  Halliburton
>
>
>
>
>  On Fri, Jan 22, 2010 at 1:13 PM, Joel Perez <tman701 at gmail.com> wrote:
>  Hey Guys,
>
>  I have a customer that is experiencing a weird issue.
>  Currently some of their forwarded calls are failing after 29 secs. I
> believe it is only happening when the calls are forwarded to 2 specific
> carriers, but cant confirm that yet.
>  I have a ticket open with the carrier so that they can take a look at the
> traces we have captured.
>  The issue happens the following way. Inbound call to main company DID
> goes to an AA, if no choice is used by the caller then it goes to a live
> person. However afterhours this live person forwards their call to an
> offsite #. When that offsite # receives the forwarded call they are only
> able to stay on for 29 secs then the call dies on both ends.
>
>  THe set up is as follows:
>  Carrier---sip---CUBE----sip---CUCM---sccp---IPT
>  CUCM is 7.0
>  Unity is 7.0
>  CUBE is 12.4.(20T4)
>
>  I have tried capturing debugs on the CUBE but havent been able to see any
> SIP (BYE) messages from either side.
>  This only happens when Unity is involved. Normal CFW doesnt have this
> problem.
>
>
>  Thanks,
>
>  Joel P
>
>
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