Network%20Announcements%20with%20SIP

1
Network Announcements with SIP

• IETF 56
• Eric Burger
• eburger_at_snowshore.com

2
Open Issue Media on Hold

• What Does Media Server Do When It Receives Hold
  Requests? RFC3264
• Option 1 Suspend Play Time Stops for VoiceXML
• Option 2 Time Moves Forward (Same as PSTN)
• Option 3 Invoker Specified

• Option 4
• asendonly/recvonlySilently Play Media (no RTP)
  Time Moves Forward
• ainactiveSuspend Play (Better than PSTN?)
• Call Waiting Interaction w/IVR
• Not An Issue w/ Early Media

Propose Option 1
3
Open Issue 409 Result Code

• 487 Reserved for Response to CANCEL
• Virtual CANCEL idea didnt fly
• Would 480 Be Better?
• Looks like out of resource, but
• Distinct from 503
• Only Issue for annc

• Proposal New Result Code
• 409 REQUEST REJECTED
• The UAS has, for whatever reason, rejected the
  request. Use cases for this result code include
  the user at the UAS explicitly rejecting the
  request (e.g., releasing the call before
  answering) or to terminate a session that occurs
  before the session is fully established.

4
Open Issue Multiple Media Streams

• Netann describes a mechanism with associating a
  single URI for play or IVR with the given SDP.
• What about audio and video?
• Associate SDP mlines with URI parameters
• Embed play/script targets in SDP
• Punt
• Not an issue if play URI is a composite object
  (e.g., MPEG-2 or MPEG-4)
• Is this is predominant use case?

5
Planned Changes for 06

• Show full early media exchanges (OK to PRACK)
• VoiceXML Keywords w/o Values Generates 404 With
  Explanation
• Eradicate stray 487s
• Describe Overload Behavior (503)