I don't think the issue here is SIP vs. SCCP, but rather the phone model. I myself have not worked with 3905 and hope I never have to, but just like with other previous models newly released phone models may experience more bugs than others.
To provide some help here, did you upgrade the phone to latest firmware?
What firmware are you using and what version of CUCM/CME?
What are you observing when you invoke these fetures?
the firmware on the phones is the latest, 9.2(2). The CME is 9.0 the ios is 15.2.2T1.
When I try put a call on hold pressing the pause button, the call drops, same thing when I try transfer a call pressing the transfer button. In both cases after the call is dropped, I dial tone appears.
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