o move all additional functionality into separate patches and make it
opt in. It has been concern of asterisks devs that the FreeBSD pacakage
adds functionalty not present in the original version, whch could be
confusing.
- Improve codec negotiation logic.
- make sure to parse SDP on re-INVITE.
o chan_zap.c:
- If unanswered Zap channnel is hanged up wait until the calling party
in turn hangs up (by detecting ring timeout). Otherwise next ring will
trigger a "new" incoming call. This appears to be design limitation of
the analogue telephone system - there is no way to reject the call without
answering it first.
Sponsored by: Porta Software Ltd, PBXpress Inc
