Yes, I am using this setup for quite long time. Following is log..
Vox281 is id of Voxalot xxxxxx and calling **700 where pbxes is defined...the problem seems in following highlighted sip response..
VERBOSE[17935] logger.c: -- Called Vox281/**700
VERBOSE[13298] chan_sip.c: SIP response 407 to standard invite
VERBOSE[13298] logger.c: We're at 78.46.102.143 port 40078
VERBOSE[13298] logger.c: Video is at 78.46.102.143 port 41708
VERBOSE[13298] logger.c: Adding codec 0x4 (ulaw) to SDP
VERBOSE[13298] logger.c: Adding codec 0x8 (alaw) to SDP
VERBOSE[13298] logger.c: Adding codec 0x10 (g726) to SDP
VERBOSE[13298] logger.c: Adding codec 0x400 (ilbc) to SDP
VERBOSE[13298] logger.c: Adding codec 0x2 (gsm) to SDP
VERBOSE[13298] logger.c: Adding non-codec 0x1 (telephone-event) to SDP
VERBOSE[13298] chan_sip.c: SIP response 100 to standard invite
VERBOSE[13298] chan_sip.c: SIP response 100 to standard invite
VERBOSE[13298] logger.c: --
Got SIP response 603 "Declined"
VERBOSE[17935] logger.c: -- SIP/Vox281-f577 is busy
VERBOSE[17935] chan_sip.c: Hangup call SIP/Vox281-f577, SIP callid
701d75b307ea847f51f740943c45ad5e@us.voxalot.com
VERBOSE[17935] logger.c: == Everyone is busy/congested at this time (1:1/0/0)
VERBOSE[17935] chan_sip.c: Hangup call SIP, SIP callid admt2zmgi665.1qcq35q8x1eyitg@188.40.65.148