I have a call manager box talking to the PSTN via SIP SP.
My Ip2Ip GW sits in the middle so i have
CCM4.2 -> SIP IP2IP GW -> SIP to SP
If is make or receive a call everything is good if i then transfer the call on to another phone after about 15 secs of the call being OK it disconnects.
If i change it to CCM4.2 -> H323 IP2IP GW -> SIP to SP
Everything is fine, its only when i use SIP all the way through which is what i want to do for other reasons..
Anyone got any ideas what it could be??