BRI trunk-group failover

[Youssef Aoufi]

Hi there,

I have 4 BRI ports on two Vwic cards.

I put all the bri interfaces on a single trunk-group without a hunt scheme.

When all BRI are connected everything's working ok. When a BRI is busy, the outbound call is directly routed through another port.

The problem is when one BRI is disconnected (unplugged) or there is a telco problem, the call stucks is this port and the call doesn't failover to the second BRI.

trunk group 1

description TRUNK for BRI 0/0/1 0/1/0 0/1/1

!

interface BRI0/0/1

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn static-tei 0

trunk-group 1

!

interface BRI0/1/0

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn static-tei 0

trunk-group 1

!

interface BRI0/1/1

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn static-tei 0

trunk-group 1

!

dial-peer voice 10 pots

trunkgroup 1

description utliser pour les appels vers FIXE BELGIQUE

translation-profile outgoing APPELS_SORTANTS

destination-pattern 0........$

progress_ind setup enable 3

progress_ind alert enable 8

direct-inward-dial

forward-digits all

!

Thank you in advance

[Chris Deren]

Use cable-detect

To enable cable polling on an analog Foreign eXchange Office (FXO) voice port, use the cable-detect command in voice port configuration mode. To disable cable polling, use the no form of this command.

cable-detect

no cable-detect

Syntax Description

This command has no arguments or keywords.

Command Default

Cable polling on an analog FXO voice port is disabled.

Command Modes

Command History

Release	Modification
15.1(1)T	This command was introduced.

Usage Guidelines

The FXO port is in the busyout state if the Digital Signal Processor (DSP) detects that no cable is connected between the analog Foreign eXchange Subscriber (FXS) and FXO ports. If you have configured the no cable-detect command and the analog FXO voice port is in busyout state because no cable is connected, the Cisco IOS software stops polling the cable connection. The analog FXO voice port remains in the busyout state until you use the shutdownand no shutdowncommands to switch the analog FXO voice port to the idle state. The cable-detect command supports loop start and Central Automatic Message Accounting (CAMA) signaling.

The cable-detect command can be configured on the following analog FXO voice interface cards (VICs):

• VIC2-4FXO
• EM-HDA-6FXO
• EM-HDA-3FXS-4FXO
• EM-HDA-4FXO

Examples

The following example shows how to enable cable polling on an FXO voice port:

Router> enable

Router# configure terminal

Router(config)# voice-port 1/2/3

Router(config-voiceport)# cable-detect

Chris

[Youssef Aoufi]

Thanks Chris for your answer ,

I'm not using FXO ports, but BRI ports.

Regards

[paolo bevilacqua]

In the past, someone had posted a solution for this issue, that very intuitively involved configuring custom cause codes.

I did not have a chance to test it, but I think you can still find the post using a search.

In the meanwhile I think the best approach is to obtain solid service from telco.

[Youssef Aoufi]

Thanks Paolo,

I can assure you that i have searched the web and the cisco forum befor posting this question, but i haven't found a solution yet.

regards

[Chris Deren]

How about removing trunk group and building multiple dial peers with preferences, does that result in the same issue?

Chris

[Youssef Aoufi]

Hi chris,

I think using multiple dial-peers with different preferences in conjunction with the command : no dial-peer outbound status-check pots resolves the problem.

But i have a large number of dial-peers and using this we lose the benefit of trunk-groups.

regards

[paolo bevilacqua]

Check this, it was reported a bug

https://supportforums.cisco.com/message/3268844#3268844

[Youssef Aoufi]

Hi Paolo ,

My IOS is:

Version 15.2(3)T, RELEASE SOFTWARE (fc1)

Regards

[paolo bevilacqua]

Have you configured voice class cause code ?

[Youssef Aoufi]

hi,

No, and i don't know why and how to use it.

regards

[paolo bevilacqua]

Look int the config poste in the thread referenced.

[Ayodeji Okanlawon]

Youssef,

This is the command I have used in the past....try it

trunk group XXXX

max-retry 4

voice-class cause-code 34

hunt-scheme round-robin both down

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