MGCP with PRI outgoing calls problem

[Mohamed_wahid]

Hi,

I have a cluster of call manager version 7.1(5) and 1 MGCP voice gateways with a 1 PRI to call the PSTN . the PRI worked fine in incaming calls case

but in outgoing calls not work

Note: 1- the voice gateway registed on call manager

         2-Please find below the debuge ISDN q931 when i need to establesh call with PSTN :

*Jan 24 09:01:32.600: ISDN Se0/2/0:15 Q931: TX -> SETUP pd = 8  callref = 0x0003

        Sending Complete
        Bearer Capability i = 0x8090A3
                Standard = CCITT
                Transfer Capability = Speech
                Transfer Mode = Circuit
                Transfer Rate = 64 kbit/s
        Channel ID i = 0xA9839F
                Exclusive, Channel 31
        Calling Party Number i = 0x0081, '2222'
                Plan:Unknown, Type:Unknown
        Called Party Number i = 0x80, '01064861110'
                Plan:Unknown, Type:Unknown
*Jan 24 09:01:32.624: ISDN Se0/2/0:15 Q931: RX <- RELEASE_COMP pd = 8  callref =
0x8003
        Cause i = 0x8286 - Channel unacceptable

[Karthik Sivaram]

hi,

For the outbound calls that fails it  uses "Exclusive, Channel 31"

see below for Q931 disconnect information:

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

86 Channel unacceptable

The service quality of the specified channel is insufficient to accept the connection. The
call attempt fails because the channel is unusable.

check your callmanager config and see how many channels your telco provides.

Can you change the order in which the B-channels is selected to see if this makes any
difference

Hope this helps!

Thanks,

Karthik

[Mohamed_wahid]

many thanks for your reply

i changed Channel Selection Order to top down .now pri uses "Exclusive, Channel 1"

but the problem still existed

[Karthik Sivaram]

hi Wahid,

Can you check with Telco as to why they think  the channel  is unacceptable to
them?  Ask them to check whether the channels on their side are active and
not busied out.  By default, the User side of the PRI starts allocating
channels from 31 and goes to 1 as simultaneous calls come in.

I asked you to change the channel selection order now you see this issue
even on channel 1.

Jan 24 09:01:32.624: ISDN Se0/2/0:15 Q931: RX <- RELEASE_COMP pd = 8  callref =
0x8003
        Cause i = 0x8286 - Channel unacceptable

The call is constantly being released by your telco.

Hope this helps!

Thanks,

Karthik