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New Member

srst problem, can not call from PRI line


below u can see my mgcp gateway config.

its c2800nm-ipvoicek9-mz.124-10.bin.

But i can not work srst on that router.

I can not call pstn from PRi line. it alwyas give busy tone even my pri line works correctly with CCM.





service alternate DEFAULT



controller E1 0/2/0

pri-group timeslots 1-28 service mgcp



ccm-manager fallback-mgcp

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server

ccm-manager config


mgcp call-agent 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 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 rtp payload-type g726r16 static


mgcp profile default



dial-peer voice 9 pots

destination-pattern 9T

incoming called-number 3199...


port 0/2/0:15

forward-digits 7





max-conferences 8 gain -6

ip source-address port 2000

max-ephones 40

max-dn 50


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Re: srst problem, can not call from PRI line

For incoming calls you'll need to add dialplan-pattern under call-manager-fallback to expand your DNs to whatever the telco is sending. For outbound calls you only have one dial-peer that will forward the last 7 digits, so only local calls will work.

Check to see if the PRI falls back to SRST when WAN is down, also posts results of "debug isdn q931" while making a call.


New Member

Re: srst problem, can not call from PRI line

Hi I had similar problems try this config which works on my SRST, note the line

"access-code pri 9.T direct-inward-dial"


secondary-dialtone 9

max-conferences 8 gain -6

transfer-system full-consult

limit-dn 7910 2

limit-dn 7935 2

limit-dn 7940 2

limit-dn 7960 2

limit-dn 7970 2

timeouts interdigit 3

timeouts ringing 20

ip source-address X.x.X.x port 2000

max-ephones 24

max-dn 48 dual-line

dialplan-pattern 1 25268... extension-length 4 no-reg

transfer-pattern 25268...

keepalive 20

access-code pri 9.T direct-inward-dial

voicemail 0003120xxxx

huntstop channel

call-forward pattern .T


time-format 24

date-format dd-mm-yy


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