[Asterisk-Users] 183 Session in Progress

[Radius]

Hi all,   From Cisco 7960 I made outgoing calls through Cisco AS5300 to PSTN by   exten => _XXXXXXXX,1,Dial(SIP/${EXTEN:[EMAIL PROTECTED],60,r). 150.11.131.2 is the Cisco AS5300 PSTN gateway.   7960 rings for the first 2 seconds, then display "Session Progress (183)" with no more rings while the phone at the other side of PSTN is ringing. However, calls can be answered and there is no problem for phone converation. The same problem happens on CIsco ATA186. However, it does NOT happen on Grandstream phones. It looks like the call setup problem is only for Cisco products.   Anybody knows what caused it and how can it be fixed??   Many Thanks.   Ben