[cisco-voip] Transfer issue dropping calls

[Jonathan Charles]

Well, you may want to upgrade to 4.1(3)sr5d and get your phone loads
updated... (the sr5d already contains the latest dev pack)...


Jonathan

On Dec 7, 2007 6:06 AM, Nick <csvoip at googlemail.com> wrote:
> Wes
>
> Ok, I don't believe we have a codec mismatch we are using G711 and we do not
> use MOH, the MRGL on the device pool does not contain any MOH resources.
>
> Is there anyway I could check to see if there anything is interupting the
> control channel during the media redirection, if the call has dropped.
>
>
>
>
>
> On 06/12/2007, Wes Sisk <wsisk at cisco.com> wrote:
> >
> > Not necessarily.
> >
> > Hold/transfer does place the call on hold.  That works fine unless one of
> the call legs meets the following criteria in 4.1:
> >
> > 1) is h323 to a device that is not h323v2 compliant with empty
> capabilities set (ECS) support
> > 2) use the CM SIP trunk
> >
> > If any call leg uses those then MTP will be required.  Otherwise,
> generally, MTP should not be required.
> >
> > Transfers typically drop calls when:
> > 1) there is a codec mismatch between the ingress gateway and the MoH
> server.  The codec negotation failure usually puts the call in a state where
> it cannot be resumed or it just immediately drops
> > 2) there is an error closing/opening media channels.  This happens with
> H.323 endpoints that do not support ECS. It happens with SIP endpoints that
> do not handle the re-invite.  It happens when there is a network condition
> that delays or interrupts the control channel (h323, sip, mgcp signaling)
> during the media redirection.
> >
> > /Wes
> >
> >
> > Jonathan Charles wrote:
> > Because when you hit the transfer key, the call is placed on hold, to
> > do that, you need an MTP.
> >
> >
> > Jonathan
> >
> > On Dec 6, 2007 12:53 PM, Voice Noob <voicenoob at gmail.com> wrote:
> >
> >
> > Why would he need an MTP to transfer a call?
> >
> >
> >
> >
> > On Dec 6, 2007 12:47 PM, Jonathan Charles <jonvoip at gmail.com> wrote:
> >
> >
> >
> > Is there an MRGL assigned to the device pool? Cuz you need an MTP to
> >
> > transfer...
> >
> >
> > Jonathan
> >
> >
> >
> >
> > On Dec 6, 2007 10:59 AM, Nick <csvoip at googlemail.com> wrote:
> >
> >
> > Has anyone come across an issue before where when you press the transfer
> > button the call gets dropped, I have one user who claims that when one
> > particular cell phone number calls in and she tried to transfer she
> >
> > loses
> >
> >
> >
> > the call.
> >
> > This is on a 7960 Version: 7.2 (4.0)
> >
> > CCM 4.1(3) sr3c
> >
> >
> >
> >
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