octtel VoIP setting pbx b call to pbx a.avi

Octtel VoIP pbx setting pbx b call to pbx a.avi at PBX (b) call out by dial "8" to access Co.line that connected to FXS VoIP Gateway- VOIP FXO gateway connected to EXT of PBX(a) when you see the status, it's seem connected between 2 gateway...