Hello,
I am using a spa508g with 7.4.9c.
I think I have found a bug.
I use TCP for signaling.
I receive a call,I send a REFER using blind transfer. The phone first send a invite to put the call in hold (as soon you hit bfer), then the refer. If I then take the call out of Hold, about 10 seconds latter the phone closes the TCP conection. Not that it dislikes the hold ans send a BYE, no it closes the whole TCP conection.
I am attaching a whireshark capture.
Thank you, Diego