Hi, does someone know which SIP Server/Registrar Voipbuster uses? I'm try to do a peering call within that network <sip:john at sip.voipbuster.com> calling <sip:alice at sip.voipbuster.com> with PJSUA and I'm getting a failure while parsing the From Header which is not standard compliant since it has the [ and ] characters in its userpart. Thanks in advance for any help Michael From: "PEERING [AA.BB.CC.DD]" <sip:PEERING_[AA.BB.CC.DD]@sip.voipbuster.com:5060>;tag=asd092k219kl User-Agent: (Very nice Sip Registrar/Proxy Server)