[Users] T.38 together with OpenSER+RTPProxy and OpenPBX not working

[Bastian Schern]

Hi everybody,

I've got a question: Does anybody get T.38 working between OpenPBX and 
OpenSER + RTPProxy?

The following scenarios are working fine:

1: SIP-FAX1 (pub. IP) <-> OpenPBX             <-> SIP-FAX2 (pub. IP)
2: SIP-FAX1 (NAT)     <-> RTPProxy+OpenSER    <-> SIP-FAX2 (pub. IP)
3: SIP-FAX1 (NAT)     <-> RTPProxy+OpenSER    <-> SIP-FAX2 (NAT)
4: SIP-FAX1 (pub. IP) <-> OpenSER <-> OpenPBX <-> SIP-FAX2 (pub. IP)


But the following scenario is not working:

SIP-FAX1 (NAT) <-> RTPProxy+OpenSER <-> OpenPBX <-> SIP-FAX2 (pub. IP)



It seems to be that the RTPproxy has a problem with the OpenPBX but no 
Problem with SIP-FAX-ATAs.

Does anybody have an idea what's going wrong???


Cheers
	Bastian