[OpenSER-Users] [OT] Looking for a good SIP PBX

Hi, first of all I'm sorry for this OffTopic. I'm looking for a good SIP PBX since Asterisk SIP implementation doesn't let me using it in a multidomain SIP enviroment properly with OpenSer ("From" domain not respected when generates a SIP channel, no good behaviour in parallel forking, etc). I can use it just as media server for now. So I'm looking for other SIP PBX server. One I've in mind is, of course, WeSIP, but I'd like to know if any of you has good experiences integrating other PBX's as FreeSwitch or SipX/SipFoundry. If possible, it would be really great a SIP PBX with virtual domains support, so the PBX logic for independent SIP domains would exist in the same server/PBX (less and easy maintenance). The aim of this PBX is to allow SIP incoming calls and during the execution of the dialplan maybe call to that domain users (registered in a multidomain main OpenSer). Please, any opinion or experience about it with some of those PBX's? I'm going now to install and try of all them, but some help would be really appreciated. Thanks a lot. Regards. -- Iñaki Baz Castillo ibc(a)in.ilimit.es