Exciting Times for Wideband SIP Clients


Yep, three of them, count ’em, three SIP xcleints should be g722 capable soon for the Mac (and linux and windows).

I have been testing (and/or talking to the authors of) these:

Blink (Mac OS X only, )

Zoiper (SIP/IAX Linux, Mac, Win)

Telephone (Mac OS X only)

They all use pjsip which caused some distortion problems at first. This thread in the Asterisk-dev mailing list sheds some light on the issues to change.



Paul L December 9, 2009 at 10:20 pm

I have been using Telephone (haven’t played with Blink, but will) on Leopard for some time now. I typically connect to an extension on my Asterisk 1.6.1 server and the Asterisk server is interconnected with a Freeswitch server.

One thing I have noticed is that the Asterisk G.722 encoded audio prompts (like when I dial into voicemail) are all ‘loud and distorted’. Voice audio between phones and softphones is just fine on G.722 calls. So maybe that has something to do with the encoding of the prompts.

Wideband prompts as well as G.722 voice calls are all clear as a bell on Freeswitch.

Polycom phones seem to work with the audio prompts and calls on both Asterisk and Freeswitch.

Zeeek/Randulo December 10, 2009 at 6:53 am

Hi Paul,

Telephone author Alexei told me yesterday he was going to look into the pjsip issue, it’s a simple workaround that fixed all the other clients. g722 is here to stay!


Adrian Georgescu December 19, 2009 at 4:06 pm

FYI, latest Blink version has the G722 problem fixed. Thanks for reporting the problem.

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