The IOS version 12.4(13r). There's nothing happened after all CCM servers are disconnected from the network.

Below please find the capture -

CCM#show ccm-manager

MGCP Domain Name: CCM

Priority Status Host

=============================================

Primary Down 192.168.3.125

First Backup Down 192.168.3.126

Second Backup None

.....

CCM#show isdn status

Global ISDN Switchtype = primary-4ess

ISDN Serial0/1/0:23 interface

dsl 0, interface ISDN Switchtype = primary-4ess

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x807FFFFF

Number of L2 Discards = 0, L2 Session ID = 9

Total Allocated ISDN CCBs = 0

CCM#

I have this same problem. I have a CUCM 4.2.3 SR3a with router IOS is C3845-spservicesk9-mz.124-7h.bin & c3845-spservicesk9-mz.124-11.T1.bin. Has this problem been resolved? and how?

javalenc,

With MGCP,

Layer 2 (q.921) terminates on the local router,

layer 3 (q.931) is backhauled to the CCM, so if the link to CCM is down, then Layer 3 shoiuld be down.

However layer 1 and layer 2 should be up since they terminate on the local gateway and the trunk from the gateway to the Tekco swicth is up....Am I worng?

If you have a switch or router on the network, that fails, you expect the frames/packets to route around the failed device. If I have T1s or PRI that can not accept a call I expect calls to be able to route around it. To do this the PRIs must indicate to the connected network it is down. I expect the loss of Layer 3 for X seconds(CCM/CUCM) to result in both layer 2 and Layer 1 going down. The CO or PBX will then route calls around the failed T1 or PRI. PBXs and COs work this way. [So I think you are wrong ;-)]

Thanks Marshall! I will try this shortly

Thank you very much!

I cannot believe this command was not enabled by default...