brad: thank you - I should eventually adopt the habit of reading.

Until then:
It seems unlikely to me that a feature so prominent as SIP support would be introduced in the final release without any beta testing. Whats your guess? Would you think the final release will somehow include SIP as a brand new feature in the telephony application? Or is this something that, although provided by the underlying framework then, will need some 3rd party software to actually work?