[cisco-voip] T321 timer on BRI channel

[James Jung]

Sorry, the below configuration might be related to the previous email or
not.

The question is I have problem understanding this "isdn timer T321 0"

 

!

interface BRI0/0/0

 no ip address

 isdn switch-type basic-net3

 isdn timer T321 0

 isdn point-to-point-setup

 isdn incoming-voice voice

 isdn map address .* plan national type unknown

 isdn bind-l3 ccm-manager service mgcp

 isdn send-alerting

 isdn sending-complete

!

interface BRI0/0/1

 no ip address

 isdn switch-type basic-net3

 isdn timer T321 0

 isdn point-to-point-setup

 isdn incoming-voice voice

 isdn map address .* plan national type unknown

 isdn bind-l3 ccm-manager service mgcp

 isdn send-alerting

 isdn sending-complete

!

 

Cisco document says setting the timer to 0 causes the timer expiry to
become infinite so that it will never expire.

What does the above configuration actually do for this "isnd timer t321
0" configuration? 

Can anyone give me a detailed explanation with actual example?

 

Many thanks.

 

 

________________________________

From: James Jung 
Sent: Friday, 21 November 2008 14:14
To: cisco-voip at puck.nether.net
Subject: T321 timer on BRI channel

 

Hi all

I have a problem and it has happened 7 times already this year.

A remote office use 2 BRI circuits controlled by CCM (4.1.3) using MGCP.

No one can make inbound and outbound call when it happens, and the isdn
status shows "Multiple-Frame.... Established" but when I make a test
call from PSTN, the q931 shows 

 

*Nov 21 10:10:54: ISDN BR0/0/0 Q931: RX <- SETUP pd = 8  callref = 0x1A 

        Sending Complete 

        Bearer Capability i = 0x8090A3 

                Standard = CCITT 

                Transfer Capability = Speech  

                Transfer Mode = Circuit 

                Transfer Rate = 64 kbit/s 

        Channel ID i = 0x89 

        Signal i = 0x40 - Alerting on - pattern 0  

        Called Party Number i = 0x80, '2551694' 

                Plan:Unknown, Type:Unknown 

        High Layer Compat i = 0x9181

*Nov 21 10:10:54: ISDN BR0/0/0 Q931: TX -> RELEASE_COMP pd = 8  callref
= 0x9A 

        Cause i = 0x80AC - Requested circuit/channel not available  

 

 

And after bouncing the bri interface or no mgcp and mgcp command, it
works fine.

Anyone can tell me what would be the cause and how to avoid this
problem?

 

Thank you very much for your help in advance.

JJ.

 

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