README


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===============================================================
README / telepathy-sofiasip
===============================================================

Building
--------

telepathy-sofiasip requires GNU make.

When building from the devel tree (you need automake-1.9):

sh> gtkdocize # (optional)
sh> autoreconf -i

And then continue with the normal:

sh> ./configure
sh> make

If using gtkdoc, a second 'make' is needed as the 1st will fail due 
to a bug in gtkdoc.

Running 
-------

Set the "SOFIASIP_PERSIST" environment variable to prevent the connection 
manager from exiting after all connections have been disconnected. This
option is only available if telepathy-sofiasip was configured with
the "--enable-debug" option.

Comments on IETF ICE compliance
------------------------------

Telepathy frameworks streamed media support was first implemented for
Jabber/Jingle ICE-RTP profile. Using the same interface for SIP based
media session setup creates some challenges (most urgent first):

Spec issues
~~~~~~~~~~~

- some differences in terms: IETF-ICE has component (candidate-id) and transport
  identifiers (tid) and a session-level password (ice-pwd), which are similar but 
  not equivalent to Telepathy transport properties 'user' and 'pass'
- the candidate-id values should be random with length of at least 
  four characters
- libjingle does not support multiple components (like one for RTP and one
  for RTCP) per candidate

Implementation issues
~~~~~~~~~~~~~~~~~~~~~ 

- open: to talk with non-ICE compliant SIP endpoints, libjingle has to
  support bypassing connectivity checks for the default candidate - can
  this be done?
- currently libjingle does not emit NativeCandidatePrepared, making it 
  more difficult to decide when to send all local candidates (whether to
  wait until one of each type of candidates is generated, or some fixed
  time interval?)