problem with H323 gateway

Unanswered Question
Aug 8th, 2008

Hi pro,

My topology is: IP Phone==CCM5.1==H323 Gateway (FXO)===PSTN.

When IP Phone receive a call from PSTN, it rings 3 times and disconnect. If I answer the call, it operate normally.

so what is the most cause of this issue?

Thank you very much!

I have this problem too.
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Chad Stachowicz Fri, 08/08/2008 - 18:14

Well, Check the phone in CCM, most likely your global Ring No Answer duration is set to 12 seconds, and on the phones you have no voicemail or forwarding set on Call Forward Ring No Answer. if you just want it to keep ringing, on the phone set the Call Forward Ring No Answer Duration up to whatever you want. 4 seconds per ring, the max is 120 seconds. TO clarify this setting it on the DN on the phone...

HTH, please rate useful posts.


huydien3384 Fri, 08/08/2008 - 21:01

thank you for you quickly respone. I have another problem.

I have configured disconnect tone on my FXO port, it works fine if I configure my gateway using MGCP (IP phone stop ringing if the PSTN phone hang up), but does not work with H323 gateway.

What should I do to solve this issue?

huydien3384 Sat, 08/09/2008 - 18:59



voice class custom-cptone vn

dualtone disconnect

frequency 450

cadence 200 200



Output Omitted



interface FastEthernet0/0

###connected to CCM

ip address

duplex auto

speed auto

h323-gateway voip interface

h323-gateway voip bind srcaddr



Output omitted




voice-port 0/1/0

supervisory disconnect dualtone mid-call

supervisory custom-cptone vn

no battery-reversal

cptone AT

timeouts call-disconnect 1

timeouts wait-release 1

timing hookflash-out 500

impedance complex2

caller-id enable


voice-port 0/1/1



dial-peer voice 8000 voip

destination-pattern 8...

session target ipv4:

dtmf-relay h245-alphanumeric h245-signal cisco-rtp

codec g711ulaw

no vad


dial-peer voice 100 pots

destination-pattern 9T

progress_ind setup enable 3

progress_ind progress enable 8

port 0/1/0





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