[cisco-voip] IP Trunk Disconnects

[Joel Perez]

Hey Steven,

I ran into this same exact problem with Verizon and a customer of mine. What
ended up fixing it was to go to 12.4.20T3 on the CUBE.
We tried the same command you just posted but it didnt help. After we went
to that version of the IOS it worked.
The problem is on the Nortel switch being used by Verizon. It detects those
tones and thinks it is a Fax call so it tries to switch over to FAX and
sends the Codec renegotiation.
In my case it wasnt a fax call and the CUBE dropped the call due to that.
For some reason not really explained to me by Verizon that IOS has a fix in
it provided by Cisco just for Verizon's use.

Good luck,

Joel P



On Thu, Jan 28, 2010 at 10:13 AM, STEVEN CASPER <SCASPER at mtb.com> wrote:

>  Having an interesting issue with a Verizon IP Trunk pilot,
>
>   Users being disconnected when certain tones are heard on a call. We can
> recreate this problem anytime by playing the Blackberry default ringer while
> a call is in progress. According to Verizon they are set up for mid-call
>  codec renegotiation when fax tone is heard on a call. The CUCM rejects
> the codec renegotiation and Verizon disconnects.
> TAC  provided an option for the CUBE which is supposed to pass the codec
> renegotiation rejection message from Call Manager to the Verizon SBC but
> this has had no effect on resolving the problem.
>
>  voice service voip
>  sip
>   header-passing error-passthru
>
> This error response applies to the following
>     4xx - request failure responses
>     5xx - server failure responses
>     6xx - global failure responses
>
> This command should pass the error received along both call legs.
>
> While this could be useful feature at times I was wondering if anyone else
> has run into this and has a fix.
>
> Thanks,
> Steve
>
>
>
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