[pjsip] PJSIP on Symbian, any pointers for tackling the audio optimization challenge?

Alex T. W. LEUNG alexleung at astri.org
Mon Apr 21 03:20:19 EDT 2008

Dear all,
I also experienced the below "audio latency" issue. Any speculations on
the possible root cause(s) of this? 
Anyway, I would like to express my gratitude for the progress pjsip has
made so far on the symbian platform. It certainly makes my N82 phone
more interesting and useful.
Alex Leung.

-----Original Message-----
From: pjsip-bounces at lists.pjsip.org
[mailto:pjsip-bounces at lists.pjsip.org] On Behalf Of Benny Prijono
Sent: Monday, January 14, 2008 5:03 PM
To: pjsip mailing list
Subject: [pjsip] PJSIP on Symbian phone works!

Dear all,

This announcement is a bit late than planned (I promised to finish the
Symbian port before Jan 2008), but we thought we'd give this a more
thorough testing before announcing it, hence the delay.

In summary, PJSIP works and tested on Symbian S60 3rd Ed phone.
Everything should work, including sound, STUN, and ICE. And we've made a
tutorial on how to build and debug PJSIP on target device here:

There have been some major changes along the way:
 - Carbide is now the preferred IDE rather than CodeWarrior. This is
because CW has been deprecated by Nokia anyway. 
 - Support for DSO is no longer enabled by default. It's still
supported, but you'd have to edit the MMP files slightly to build DSO

There are still some issues with the port:
 - audio latency is still pretty high (about 500 msec end to end) 
 - STUN resolution sometimes times out

These issues will need some resolving of course, but the important thing
is that the port is now working. So what's left to be done is for
someone to create a nice open source Symbian softphone GUI on top of it.

For more info:
 - Tutorial on building/developing/debugging PJSIP on Nokia phone:
 - The PJSIP on Symbian page also has been updated:


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