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New Member

Problem with International Calls

I have a CM3.1(2c) with an H323 PSTN gateway (2610 router with

NM-HDV-E1 voice card). Everything works fine except with International calls. In some countries we can call just fine, but in some others we get a "disconnected" tone. I have done "debug isdn q931" on a failed called, and looks like that:

18:10:25: ISDN Se1/0:15: TX -> SETUP pd = 8 callref = 0x01CD

18:10:25: Bearer Capability i = 0x8090A3

18:10:25: Channel ID i = 0xA9839F

18:10:25: Display i = 'Pambos', 0x20, 'Charalambous'

18:10:25: Calling Party Number i = 0x00, 0x80, '551237', Plan:Unknown, T


18:10:25: Called Party Number i = 0x80, '009611396963', Plan:Unknown, Ty


18:10:25: ISDN Se1/0:15: RX <- SETUP_ACK pd = 8 callref = 0x81CD

18:10:25: Channel ID i = 0xA9839F

18:10:31: ISDN Se1/0:15: RX <- DISCONNECT pd = 8 callref = 0x16AE

18:10:31: Cause i = 0x8090 - Normal call clearing

18:10:31: Progress Ind i = 0x8288 - In-band info or appropriate now avai


18:10:31: ISDN Se1/0:15: TX -> RELEASE pd = 8 callref = 0x96AE

18:10:32: ISDN Se1/0:15: RX <- RELEASE_COMP pd = 8 callref = 0x16AE

18:10:32: ISDN Se1/0:15: RX <- CALL_PROC pd = 8 callref = 0x81CD

18:10:35: ISDN Se1/0:15: TX -> DISCONNECT pd = 8 callref = 0x01CD

18:10:35: Cause i = 0x80E6 - Recovery on timer expiry

18:10:35: ISDN Se1/0:15: RX <- RELEASE pd = 8 callref = 0x81CD

18:10:35: ISDN Se1/0:15: TX -> RELEASE_COMP pd = 8 callref = 0x01CD

I get this "Recovery on timer expiry" and I don't know if its a problem on my side or the PSTN side. Also, before installing the H323 gateway, we had a DE-30+ PCI PRI selsius card, which worked great for so long with no problems.

Also, the IOS used is 12.2.7

Could anyone help please

Thank you very much


Re: Problem with International Calls

Hi, I had a simular problem.

Go to your serial interface 1/0:15, and set the following parameter;

isdn T310 60000

this should do the trick for your timeout problem.




Re: Problem with International Calls

The international gateway is not sure if there are more digits to follow after the intial setup message, so it accepts the setup but waits an interdigit timeout period before attempting to send the call to the remote destination network. At the same time, the router waits the default T310 period of 10 seconds before it decides the call is not progressing and it clears the call with a 'recovery on timer expiry' clearing code.

What you need to do is to tell the international gateway the called number in the setup message has no more digits to follow - use the following D channel command:

interface serial 1/0:15


isdn sending-complete

This will set the sending complete field in the intial Q931 setup message so the PSTN gateway will accept the call and process it immediately.

New Member

Re: Problem with International Calls

Dear pambosch,

The switch is responding to the SETUP with a SETUP ACK, which suggests that for some reason it's expecting more digits from the GW, so it has entered an "overlap sending" state, where additional digits are now expected. No more digits come, so it clears the call. This suggests perhaps a dialing plan issue - be sure that the digits you are sending match what's expected by the switch, there may be digit deletion/insertion, etc required, or a change in provisioning of the ISDN line to fix this. Else it's possible the number is just being dialed incorrectly - presumably you've tried other international phone numbers. If the switch thought it could have routed the call on the initial digits sent, it would have attemped to do so, and not sent the SETUP ACK.


Re: Problem with International Calls


I hope the following link can be usefull for your Problem.



New Member

Re: Problem with International Calls

ok guys,

my problem is solved now after increasing the T310 timer to 60000 msec.

Thank you all for the help.

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