[cisco-voip] ISDN/MGCP question

[Ed Leatherman]

Thanks guys! This makes sense.

On Fri, Feb 22, 2008 at 9:47 AM, Wes Sisk <wsisk at cisco.com> wrote:

>  Short Version:
> Your provider has made changes.
>
> Long Version:
> CM sends out CONNECT with DisplayIE.  Your provider's switch does not like
> the DisplayIE so they send back a status message.  The status message says
> callstate state=0x04.  When CM receives this message it has already
> proceeded to the connected state.  CM detects this as a state mismatch and
> clears the call.   <memoryfade> I believe it is DMS protocols which do not
> like the DisplayIE</memoryfade>.  We are attempting to 'fix' this scenario,
> but our 'fix' actually makes us non-compliant with ISDN protocols by strict
> interpretation.  See CSCeg56289.
>
> Possible fixes short of upgrade to the newest fix:
> 1) uncheck 'display ie delivery' on the gateway config page in CM
> 2) change ISDN switch types.  Also have your telco change the switchtype
> configured on their d-channel.
>
> /Wes
>



-- 
Ed Leatherman
Senior Voice Engineer
West Virginia University
Telecommunications and Network Operations
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