MGCP Gateway T1: Is is up or down?

Answered Question
Jun 2nd, 2009

I have a 2811 MGCP gateway in a CCM 4.X environment running IOS 12.4(8c). It has a T1 PRI for inbound calls. If I do a show interface on the router is shows the Serial 0/0/0:0 and all other timeslots (1-23) as down/line protocol down. However, the T1 is still registered in CCM and the last event logged in the router is that interface Serial 0/0/0:0 is up.

Since this configured for MGCP, would that cause this apparent contradiction? If I do a show mgcp endpoints they all show as up.

Thanks

Correct Answer by Nicholas Matthews about 7 years 8 months ago

The b-channels are not required for any type of data and are a place holder in IOS. You are worried about the status of these commands:

show isdn status (multiple frame established)

show isdn service ( 0 is good state )

show controller t1

hth,

nick

Correct Answer by Jaime Valencia about 7 years 8 months ago

At least that T1 is fine based on that output

HTH

java

if this helps, please rate

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Jaime Valencia Tue, 06/02/2009 - 08:53

If you issue a sh isdn status what's the status?

You should clearly see the status there.

If you call what happens?

HTH

java

if this helps, please rate

gmgarrian Tue, 06/02/2009 - 09:00

Calls are successful, but this is a resent port and I suspect the number was ported to the wrong T1 (there's another T1 at this site.

Here's the output from the sh isdn stat:

Global ISDN Switchtype = primary-ni

%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may not appl

y

ISDN Serial0/0/0:23 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 = 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 = 13

Total Allocated ISDN CCBs = 0

Correct Answer
Jaime Valencia Tue, 06/02/2009 - 09:32

At least that T1 is fine based on that output

HTH

java

if this helps, please rate

Correct Answer
Nicholas Matthews Tue, 06/02/2009 - 15:28

The b-channels are not required for any type of data and are a place holder in IOS. You are worried about the status of these commands:

show isdn status (multiple frame established)

show isdn service ( 0 is good state )

show controller t1

hth,

nick

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