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mgcp gw to nortel pbx not working properly

hi ,

i have a 2911 t1 using mgcp on call manager 8.6.2.  dms-100 is the switch type between this gw adn the nortel pbx 61c.  internally calling from cisco to pbx or vise versa not working correctly.  one thing to note here is that 2911 is the network side and providing clocking.  we tried pbx to be network adn clock but it didnt work..it was spitting out BAD FRAME error msg and the layer 1 was not coming up either. so i decided to use 2911 as network and clock...below is the debug isdn q931 meg calling from nortel to cisco.

Jan 19 21:57:00.874: ISDN Se0/0/0:23 Q931: RX <- SETUP pd = 8  callref = 0x17

        Bearer Capability i = 0x8090A2

                Standard = CCITT

                Transfer Capability = Speech 

                Transfer Mode = Circuit

                Transfer Rate = 64 kbit/s

        Channel ID i = 0xE9808317

                Exclusive, Interface 0, Channel 23

        Display i = 0xB1, '4234WSB07 LAB'

        Calling Party Number i = 0x0980, '4234'

                Plan:Private, Type:Unknown

        Called Party Number i = 0x89, '3881'

                Plan:Private, Type:Unknown

Jan 19 21:57:00.882: ISDN Se0/0/0:23 Q931: TX -> CALL_PROC pd = 8  callref = 0x97

        Channel ID i = 0xA98397

                Exclusive, Channel 23

Jan 19 21:57:00.882: ISDN Se0/0/0:23 Q931: TX -> ALERTING pd = 8  callref = 0x97

Jan 19 21:57:00.882: ISDN Se0/0/0:23 Q931: TX -> NOTIFY pd = 8  callref = 0x97

        Connected Address i = 0x0081, '8673881'

        Notification Ind i = 0xF1

        Display i = 'WKSTN9003 VACANT'

Jan 19 21:57:00.914: ISDN Se0/0/0:23 Q931: RX <- RELEASE pd = 8  callref = 0x17

Jan 19 21:57:00.918: ISDN Se0/0/0:23 Q931: RX <- RELEASE pd = 8  callref = 0x17

Jan 19 21:57:00.942: ISDN Se0/0/0:23 Q931: TX -> RELEASE_COMP pd = 8  callref = 0x97

as you can see..no error msg. the cisco phone rings fraction of a second then stops.  and i see a release msg coming from pbx.  it appears that whatever i am sending in the TX->NOTIFY msg not being realized by pbx..thus pbx terminates it.

any clue...any gotcha??

much appriciated.

i have not tried this on a h323 gw...i will try later...

thanks

vijay

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Red

mgcp gw to nortel pbx not working properly

Hi Vijay,

On the CUCM side, can you please check;

Under - PRI Protocol Type Specific Information

MCDN Channel Number Extension Bit Set to Zero (checked)

We run the same setup as this, and this setting hit us one night in the middle of an upgrade

There are also some helpful tips in this good (older - like me ) doc

Cheers!

Rob

Please remember to tag your threads and help support "Teachers without Borders"

https://supportforums.cisco.com/community/netpro/idea-center/communityhelpingcommunity

4 REPLIES
Hall of Fame Super Red

mgcp gw to nortel pbx not working properly

Hi Vijay,

On the CUCM side, can you please check;

Under - PRI Protocol Type Specific Information

MCDN Channel Number Extension Bit Set to Zero (checked)

We run the same setup as this, and this setting hit us one night in the middle of an upgrade

There are also some helpful tips in this good (older - like me ) doc

Cheers!

Rob

Please remember to tag your threads and help support "Teachers without Borders"

https://supportforums.cisco.com/community/netpro/idea-center/communityhelpingcommunity

mgcp gw to nortel pbx not working properly

ya..you are correct. i did this last night and got it working...but thats exactly what i did..thanks for hte help.

i have just one follow up question. how do i block the connected address being transfered to the pbx..as you can see on the above debug isdn q931.

Connected Address i = 0x0081, '8673881'

i need to make sure it is not transfered..becuaes the users are dialing 4 digits on pbx..tehn their nortel phone display becomes 8673881 automatically..that will be confusing to users..

thanks again.

Green

mgcp gw to nortel pbx not working properly

Hi Rob,

WOW (+5 )

Great find.

From another old timer

Regards

Alex

Regards, Alex. Please rate useful posts.
Hall of Fame Super Red

mgcp gw to nortel pbx not working properly

Hey Alex,

Thanks buddy

You don't forget the issues that caused you so much pain even when you get old like us! 

Cheers!

Huff

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