22 Apr
2010
22 Apr
'10
5:01 p.m.
Alex Balashov wrote:
The B2BUA+SST approach seems clean, efficient, and at
least from a
theoretical point of view, rather reliable.
clean? I am not so sure any more,
trying to hack something together to
see where this gets. Is there a clean and simple method to do
re-invite from the b2bua, which catches all the possibilities (changed
session etc)?
e.g., one possibility, reinvite with last SDP from the other side
A b2b B
|---INVITE / SDPa-->| |
| |---INVITE / SDPa-->|
| | |
| |<-- OK/SDPb--------|
| |--- ACK ---------->|
|<-- OK/SDPb--------| |
|--- ACK ---------->| |
| | |
... sst timer expires ...
| | |
|<--INVITE / SDPb---| |
| | |
|--- OK/SDPc------->| |
now what? ignore that, or do
| |---INVITE / SDPc-->|
| |<-- OK/SDPd--------|
one more round of ping-pong?
| | |
or, other possibility, empty reinvite:
A b2b B
|---INVITE / SDPa-->| |
| |---INVITE / SDPa-->|
| | |
| |<-- OK/SDPb--------|
| |--- ACK ---------->|
|<-- OK/SDPb--------| |
|--- ACK ---------->| |
| | |
... sst timer expires ...
| | |
|<--INVITE | |
| | |
|--- OK/SDPc------->| |
now what? ignore that, or do
| |---INVITE / SDPc-->|
| |<-- OK/SDPd--------|
one more ping-pong?
| | |
Maybe I just got confused and there is a simple solution?
Stefan
--
Stefan Sayer
VoIP Services Consulting and Development
Warschauer Str. 24
10243 Berlin
tel:+491621366449
sip:sayer@iptel.org
email/xmpp:stefan.sayer@gmail.com