MGCP Drops Calls

[ITforever]

Hi,

We have a problem with one of our MGCP gateways. The connectivity is as follows:

PBXPhones --- SiemensPBX ---E1@MGCP_Local---CUCM---MGCP_External-E1--PSTN

The problem is when PBXPhones make a call to mobile phones (GSM Network), they hit the E1 port of LGCP Local. My expectation is that MGCP Local E1 should make a call to the dialed number towards CUCM. And the CUCM should send the call to the PSTN via MGCP External. However, I get an isdn disconnect on MGCP_Local with the following cause code:

Dialed Number Analyzer shows that the call is successful from MGCP_Local E1 to the dialed number (cell phone) via MGCP_External

Cause i=8083 No route to destination.

Any ideas what might be wrong or missing?

Cheers

Anar

[Jaime Valencia]

That usually means routing issues or CSS/partitions issues, I'd start by checking all that.

HTH

java

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[ITforever]

Jamie,

The CSS on E1 port contains the partition in which I have the required RP. What else do I need to check? Moreover, as I have mentioned earlier, the CUCM DNA says a call from E1@MGCP_Local  to the PSTN is successful.

Am I missing anything else?

[Ayodeji Okanlawon]

Can you send a debug isdn q931 from the local mgcp gateway. Include the calling and called number

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[Jaime Valencia]

Are yousending the right set of digits?

Do you need any transformation??

Is the significant number of digits properly configured?

HTH

java

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[ITforever]

Here is a snippet from debug isdn q931 output:

*May 14 13:08:30.051: ISDN Se0/1/0:15 Q931: RX <- SETUP pd = 8  callref = 0x0005

        Bearer Capability i = 0x9090A3

                Standard = CCITT

                Transfer Capability = 3.1kHz Audio

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0xA98398

                Exclusive, Channel 24

        Facility i = 0x91AA068001008201008B0100A1190202E5C006042B0C0900A10D04084452494C4C494E47020101

        Progress Ind i = 0x8183 - Origination address is non-ISDN

        Calling Party Number i = 0x0083, '75812'

                Plan:Unknown, Type:Unknown

        Called Party Number i = 0x80, '0051660XXXX'

                Plan:Unknown, Type:Unknown

        Locking Shift to Codeset 5

        Codeset 5 IE 0x31  i = 0x82

*May 14 13:08:30.055: ISDN Se0/1/0:15 Q931: TX -> RELEASE_COMP pd = 8  callref = 0x8005

        Cause i = 0x8083 - No route to destination

And note that I do have 0050XXXXXXX pattern in CUCM. Its partition is included in the CSS assigned S0/1/0 interface.

[Jagpreet Singh]

Hi Anar,

     Now this just might be a typo, but the called number which we get from the Siemend PBX is 0051660XXXX and the route pattern which you say that you have configured is 0050XXXXXXX.

I have highlighted the difference. In case this was a typo:

> Have we tried running a debug on the external MGCP gateway, does the call reach there? If so, please attach the ouput.

Regards,

Jagpreet

[ITforever]

Hi Jagret,

Sorry, my mistake. The pattern is 0051XXXXXXX. So we should eliminate this.

As far as the external MGCP is concerned, it does not get anything re the call from 75812(PBX) to 0051660XXXX(GSM).

Cheers

Anar

[Ayodeji Okanlawon]

Can you send usvcucm SDI traces. Make sure the tsce level is set to detailed.


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