tandem call on BCM 4.0 SIP trunk 1

[dariusb]

Hello.

I have two BCM's 4.0 at different location connected over voip tunks.H323 and SIP key kode is enabled.Tandem calls works fine bcm<h323>bcm<isdn>pstn and bcm<sip>bcm<isdn>pstn ,but... I also use voip gateway(patton smartnode1400 with h323/sip software) and installed demo MCS5100(sip).Everything works fine,i can call to all directions,but sip tandeming calls over bcm fail/disconnect after ~10-30 second becauce bcm do not sent to calling side(patton or mcs) "connect ack" or something similar... Any one has similar problem and how to solve this...

Darius

 

[teekow]

I have had problems with G.729 between BCM and voip gateways. If you use G.729, you have to make sure it is the same version of G.729. There is G.729A, B, and AB. A mismatch will cause calls to not setup. You can try G.711 U-LAW and see if that works. If you still need compression, try G.723.

Good Luck
Rob

 

[dariusb]

I am sure 100% this is not codec.This is signaling problem.

 

[teekow]

If you aren't using G.711, I would still recommend trying it to make sure.

As always, please post results if you find a solution....

Good Luck
Rob

 

[dariusb]

As i said,tandeming work,but conversation duration only ~15-20 seconds....because smartnode and/or mcs disconect call(i use sip signaling debuger) BECAUSE bcm not "inform" remote equipment that connection is OK(connection acknowledge).

 

[dariusb]

Hi,I found(with ethereal) that BCM use PRACK(ftp://ftp.rfc-editor.org/in-notes/pdfrfc/rfc3262.txt.pdf) signaling method on SIP.If other equipment not support this(PRACK) it will be problem with tandeming calls through BCM.May be it is possible to disable this on BCM?!?I don't know.
I'll try BCM tandeming with quintum voip gateway(manual sait that prack pasible to enable/disable on this equipment).

 

[NARSBARS]

dariusb

Thanks for the research. It may help avoid problems for a lot of us. Have a star.

NARSBARS