SRST on degraded WAN Link

Unanswered Question
Feb 15th, 2007

I have a remote site configured to use SRST in the even of a WAN failover, this all works great in this instance.

The problem I am experiencing is that the SP occasionally has problems that degrade the performance of our WAN link.

Apart from lowering the keepalives is there any way I can protect my site from this. I experience problems with SRST failover and fallback when the line performance is degraded.

Any ideas?

Thanks

I have this problem too.
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stafford.slater Fri, 02/16/2007 - 07:31

Hi Daljeet,

Below is the config, the link is a 2Mb cct running through an MPLS core,this is backed up by the SP with a 2Mb microwave cct.

The SP has recently been experiencing poor performance on the cct with losses of 20%+

If the link fails over to the microwave the router does not always failover into SRST mode. If it does it some times has trouble failing back, we recently had an event on the circuit when it failed and were unable to make outbound calls for 20min but could receive calls the router did not failover into SRST.

The keepalives are set 15 seconds is it possible that the mgcp failed and it took this long to reregister the endpoints?

Thanks

Stafford

System image file is "flash:c2800nm-spservicesk9-mz.124-6.T2.bin"

isdn switch-type basic-net3

!

voice-card 0

dspfarm

!

application

global

service alternate DEFAULT

!

interface BRI0/1/0

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn bind-l3 ccm-manager service mgcp

isdn static-tei 0

!

interface BRI0/1/1

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn bind-l3 ccm-manager service mgcp

isdn static-tei 0!

!

control-plane

!

!

voice-port 0/1/0

compand-type a-law

cptone GB

!

voice-port 0/1/1

compand-type a-law

cptone GB

!

!

ccm-manager fallback-mgcp

ccm-manager redundant-host 10.xxx.xxx.202 10.xxx.xxx.200

ccm-manager mgcp

no ccm-manager fax protocol cisco

ccm-manager music-on-hold

ccm-manager config server 10.xxx.xxx.201

ccm-manager config

!

mgcp

mgcp call-agent 10.xxx.xxx.201 2427 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp modem passthrough voip mode nse

mgcp ip qos dscp cs3 signaling

mgcp package-capability rtp-package

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

mgcp package-capability pre-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

mgcp bind control source-interface FastEthernet0/0

mgcp bind media source-interface FastEthernet0/0

!

mgcp profile default

!

!

dial-peer voice 3 pots

service mgcpapp

destination-pattern 9T

incoming called-number .

direct-inward-dial

port 0/1/0

!

dial-peer voice 4 pots

service mgcpapp

destination-pattern 9T

incoming called-number .

direct-inward-dial

port 0/1/1

!

dial-peer voice 999000 pots

service mgcpapp

port 0/0/0

!

!

!

call-manager-fallback

secondary-dialtone 9

max-conferences 8 gain -6

transfer-system local-consult

timeouts interdigit 5

ip source-address 10.xxx.xxx.xxx port 2000

max-ephones 30

max-dn 60 dual-line

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