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MGCP Gateway T1: Is is up or down?

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

2 ACCEPTED SOLUTIONS

Accepted Solutions
Cisco Employee

Re: MGCP Gateway T1: Is is up or down?

At least that T1 is fine based on that output

HTH

java

if this helps, please rate

HTH

java

if this helps, please rate

www.cisco.com/go/pdi

Re: MGCP Gateway T1: Is is up or down?

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

5 REPLIES
Cisco Employee

Re: MGCP Gateway T1: Is is up or down?

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

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
New Member

Re: MGCP Gateway T1: Is is up or down?

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

Cisco Employee

Re: MGCP Gateway T1: Is is up or down?

At least that T1 is fine based on that output

HTH

java

if this helps, please rate

HTH

java

if this helps, please rate

www.cisco.com/go/pdi

Re: MGCP Gateway T1: Is is up or down?

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

New Member

Re: MGCP Gateway T1: Is is up or down?

Based on that, everything looks good.

Thanks for the info.

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