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MGCP -gateway registration problem

After configure MGCP-gateway on CCM i see on Router next log-

After receving RESTART from Telco switch CCM send RESTART_ACK with strange channel -Channel 127

#Debug isdn q931

*Dec 5 09:00:21.995: ISDN Se0/0/0:15 Q931: RX <- RESTART pd = 8 callref = 0x0000

Channel ID i = 0xA1830102030405060708090A0B0C0D0E0F1112131415161718191A1B1C1D1E9F

Preferred, Channel 1

Restart Indicator i = 0x80

*Dec 5 09:00:22.027: ISDN Se0/0/0:15 Q931: TX -> RESTART_ACK pd = 8 callref = 0x8000

Channel ID i = 0xA9937FFF7FFF

Exclusive, Channel 127

Restart Indicator i = 0x80

*Dec 5 09:00:22.051: ISDN Se0/0/0:15 Q931: RX <- STATUS pd = 8 callref = 0x0000

Cause i = 0x82E418 - Invalid information element contents

Call State i = 0x3D

*Dec 5 09:00:49.891: ISDN Se0/0/0:15 Q931: TX -> SETUP pd = 8 callref = 0x0001

Bearer Capability i = 0x8090A3

Standard = CCITT

Transfer Capability = Speech

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA9839F

Exclusive, Channel 31

Display i = 'R M'

Calling Party Number i = 0x0081, '1412'

Plan:Unknown, Type:Unknown

Called Party Number i = 0x80, '3452245'

Plan:Unknown, Type:Unknown

*Dec 5 09:00:49.915: ISDN Se0/0/0:15 Q931: RX <- STATUS pd = 8 callref = 0x8001

Cause i = 0x82E328 - Information element not implemented

Call State i = 0x01

*Dec 5 09:00:49.919: ISDN Se0/0/0:15 Q931: RX <- RELEASE_COMP pd = 8 callref = 0x8001

Cause i = 0x82AC - Requested circuit/channel not available

Display i = 'REQUESTED CHANNEL NOT AVAILABLE'

When we trying to made calls we recived busy and message - REQUESTED CHANNEL NOT AVAILABLE.

where is the problem?

4 REPLIES
New Member

Re: MGCP -gateway registration problem

you have "Cause i = 0x82E418 " in your debug.

Cause 82: No route to specified network.

The ISDN exchange receives a request to route the call through an unrecognized intermediate network.

This cause indicates that the equipment receives a request to route the call through a particular transit network. However, the equipment does not recognize the network.

The equipment that sends this cause does not recognize the transit network due to one of these reasons:

The transit network does not exist.

The transit network exists, but does not serve the equipment that sends this cause.

This cause is supported on a network-dependent basis.

http://www.cisco.com/en/US/partner/tech/tk801/tk379/technologies_tech_note09186a008012e95f.shtml

BR

M

New Member

Re: MGCP -gateway registration problem

The Telco Provider told me that the problem at my side-because we send him

RESTART_ACK with unknown channel -

*Dec 5 15:00:08.543: ISDN Se0/1/0:15 Q931: TX -> RESTART_ACK pd = 8 callref = 0x8000

Channel ID i = 0xA9937FFF7FFF

Exclusive, Channel 127

And the block all DS on their side.

Don't know the meanings of that Channel 127!

Can you explain or show me where it's possible to see?

New Member

Re: MGCP -gateway registration problem

Do a loopback test and see if your controller comes up and registers with callmanager.

Also post your gateway config.

New Member

Re: MGCP -gateway registration problem

How many channels on your PRI? It appears that the call is going out on 15 which if not available, will create this message. Check you service module timeslots to ensure they match your PSTN setup.

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