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

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