Device: Cisco/SPA508G
Old Firmware: 7.4.8a, SIP Capture File NOTIFY-GOOD.cap
Frame 18: REFER (Supervised transfer) received by phone
Frame 19: INVITE w/ Replaces - New call, that is result of REFER
Frame 22: Response 183 for the new call
Frame 23: NOTIFY with Sipfrag 183, and Subscription-State: active
Frame 29: Response 200 for the new call
Frame 30: NOTIFY with Sifrag 200, and Subscription-State: terminated
That is correct behavior.
Noe look at
New Firmware: 7.5.1a, SIP Capture File NOTIFY-BAD.cap
Frame 16: REFER (Supervised transfer) received by phone.
Frame 17: New call INVITE w/ Replaces
Frame 20: Response 183 for the new call
Frame 21: NOTIFY with Sifrag 200, and Subscription-State: terminated
That is incorrect behavior. and it causing problem in our system.
