[cisco-voip] ISDN sudden disconnect.

[Tanner Ezell]

Well, this is a 1760 running 12.4(15)T9, how do you check for DSP errors?

On Fri, Aug 21, 2009 at 10:12 AM, Ted Nugent <tednugent73 at gmail.com> wrote:

> What version of code are you running, MGCP/DSP errors tend to run rampant
> and are typically responsible for issues like this. are you showing any dsp
> errors in the logs? We've had very good success with 12.4(15)T8+ as far as
> MGCP/DSP stability. Cisco has tried pushing me a few time to higher levels
> of code and I've almost always gone back to this version because of bugs.
> Another note that probably has no bearing on the problem but is a good
> practice you should lock in your calling numbering type/plan to
> isdn/national and leave called to unknown/unknown, it can cut down on other
> issues down the road (provider dependent). HTH
> Ted
>
>
>
> On Fri, Aug 21, 2009 at 12:08 PM, Tanner Ezell <tanner.ezell at gmail.com>wrote:
>
>> I have a MGCP gateway connected via PRI. Whenever a call comes in from the
>> PRI, the IP Phone rings a single time and then disconnects. On the gateway,
>> debug isdn q931 reports:
>> *Mar  1 11:04:27.327: ISDN Se1/0:23 Q931: RX <- SETUP pd = 8  callref =
>> 0x0008
>>  Bearer Capability i = 0x8090A2
>> Standard = CCITT
>> Transfer Capability = Speech
>>  Transfer Mode = Circuit
>> Transfer Rate = 64 kbit/s
>> Channel ID i = 0xE1808397
>>  Preferred, Interface 0, Channel 23
>> Calling Party Number i = 0x00C0, N/A
>>  Plan:Unknown, Type:Unknown
>> Called Party Number i = 0xA1, '5032733100'
>>  Plan:ISDN, Type:National
>> *Mar  1 11:04:27.343: ISDN Se1/0:23 Q931: TX -> RELEASE_COMP pd = 8
>>  callref = 0x8008
>> Cause i = 0x80A9 - Temporary failure
>>
>> I'm wondering if this is a dsp issue, as a call into the POTS line works
>> fine, but sending that call to an IP Phone I get this issue. Any
>> suggestions?
>>
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>>
>
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