On this particular instance whereas after I configured ISDN MGCP on the HQ router and ISDN layer2 did not came up. After checking with the obvious CLI such as "show mgcp endpoint , show mgcp status , show ccm-manager host" and realize everything looked good. Decided to reload the router and that fixed the problem
HQ#sh isdn sta
Global ISDN Switchtype = primary-ni
%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may not apply
ISDN Serial1/0:23 interface
dsl 0, interface ISDN Switchtype = primary-ni
L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
HQ#sh mgcp end
Interface T1 1/0
ENDPOINT-NAME V-PORT SIG-TYPE ADMIN
S1/ds1-0/1@HQ 1/0:23 none up
S1/ds1-0/2@HQ 1/0:23 none up
S1/ds1-0/3@HQ 1/0:23 none up
Interface T1 1/1
ENDPOINT-NAME V-PORT SIG-TYPE ADMIN
HQ#sh mgcp stat
.........
IP address based Call Agents statistics:
IP address 10.1.200.21, Total msg rx 77,
successful 68, failed 9
................................
HQ#sh ccm-manager hosts
MGCP Domain Name: HQ
Priority Status Host
============================================================
Primary Registered 10.1.200.21
First Backup None
Second Backup None
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You may do following action to save your time. First, enter the serial interface, then remove the line "isdn bind-l3 ccm-manager". After that, using the show isdn status to make sure the link was up, then finally add the "isdn bind-l3 ccm-manager" back to the configuration. It will save you a lot of time compared to the reload the router.
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