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2851 MGCP Voice gateway problems

We have just deployed a 2851 router as an mgcp gateway with CCM 4.1 (3)...

However, only one of the 30 channels availbale from the voice card installed in the router is used for calls. All the timeslots have been enabled using the

controller E1 0/0/1

line-termination 75-ohm

pri-group timeslots 1-31 service mgcp...

The challenge is that only one of the channels get selected for voice-calls, no other channel get selected.

when I do a show voice call status...I get the following:

CallID CID ccVdb Port DSP/Ch Called # Codec Dial-peers

0x18F 1111 0x45ED670C 0/0/0:15.31 0/1:2 g711ulaw 1/0

0x19B 1189 0x45ED3B14 0/2/0:15.31 0/1:1 g711ulaw 1/0

0x1A7 1266 0x45ED50BC 0/1/0:15.31 0/1:3 g711ulaw 1/0

3 active calls found....

Which shows that only channel 31 get selected on all 3 voice cards. No other calls can be made at this time unless one of the channels is freed...

when i do a show ccm-manager I get an error at the end of the output saying "Configuration Error History:

controller E1 0/2/1no pri-group timeslots 1-31

controller E1 0/2/0no pri-group timeslots 1-31

controller E1 0/1/1no pri-group timeslots 1-31

controller E1 0/1/0no pri-group timeslots 1-31

controller E1 0/0/1no pri-group timeslots 1-31

controller E1 0/0/0no pri-group timeslots 1-31"

I have attached debug and show commands

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New Member

Re: 2851 MGCP Voice gateway problems

Please send the sh tech of every device in the call flow. What exact issue are you facing and how did you notice this problem? Only one B Channel can be used out of the whole E1 - is this correct?

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