Hi all Please assist, We have Four branches Three of them have IPO version 9 and One with Cisco Pbx, So Branch A with Avaya IPO connects to Branch B with SIP Via VPN Tunnel, Everything works fine when calling through SIP now my problem is When im seating on Branch B where there is Cisco PBX and use an AVAYA IP Phone configured to use the AVAYA settings through VPN, The problem arise when i want to call Branch C if i dail fromm Barnch B throuh SIP via VPN Connection via Branch A to Branch C via SIP On MPLS Connection the call connects fine but i can only get one way Speach i can hear the person on the other side but he cant hear me, What could be the problem