Hi!

Is there any plan to support other codecs? For example:
- G729 / G729a
- MPEG Layer 2 / Layer 3
- Standard / Enhanced apt-X
- Linear PCM / ADPCM

SIP is the defacto protcol chosen by EBU for Audio contribution over IP. It allows you to use many other codecs too, in addition to those used in VoIP.
Have a look at these docs:
http://www.uer.net/en/technical/trev/trev_2008-Q1_jonsson%20(aoip).pdf
http://tech.ebu.ch/docs/tech/tech3326.pdf

It would be nice to add broadcast-quality capabilities to your very nice software. Lots of small, low-budget, non-profit media organizations, and thus people would benefit from your work.

MPEG Layer 3 and Linear PCM shouldn't be difficult to addt, wouldn't it?

Of course it would - I'm not asking to remove the actual codecs. Compatibility with all existing clients/peers/servers would be offered by the codecs you already have now. In PhonerLite you have the possibility to define a codec priority list, and individually enable them. Great feature, adding extra codecs just can't hurt in any way. If somebody wants to use broadcast quality, they just enable the coresponding codec and move it to the top. And of course make sure on the other end there's a compatible something.

By adding new codecs like the ones I mentioned above, would offer the chance to make Phoner <> Phoner calls, or Phoner <> HardwareCodec calls in broadcast quality too.

Some hardware codecs used by broadcasters, which support SIP protocol:
http://www.avt-nbg.de/homepage_engl/start.htm?produkte/magic_ac1.htm
http://mayah.com/support/highlights4-07e.htm
http://comrex.com/products/briclink.htm
http://comrex.com/products/access.htm
http://www.stl-ip.com/

Any many more!

Since these devices are SIP-enabled, all you have to do is add new codec support to PhonerLite, and your software would additionally be compatible with these professional devices too.

Mp3 libraries are available freely, also Linear PCM (16bit/44.1kHz/Stereo) is easy to implement.

I've managed today to establish a successfull call with an AVT MAGIC AC1 XIP device, using your PhonerLite with G722 codec. All went fine! If you'd support a higher quality codec too, it would be just perfect.

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This is not a free codec! You have to pay royalty fees to use it. You won't find any freeware directly supporting that codec.


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That codec is not optimized for streaming (real time). I don't see any need for that codec in VoIP environment. You need a license for using that codec too.

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You need a license too for that codec.

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G.736 is a ADPCM codec is is supported by Phoner(Lite). Pure linear PCM is easy, but I don't see a need for it at the moment.

G.722.1 ist kein lizenzfreier Codec. Ich müsste mir also eine Lizenz dafür erwerben. Nimm es mir nicht übel, aber dazu habe ich keine Lust.
Abgesehen davon wäre G.722.2 (AMR-WB) wesentlich interessanter und meiner Meinung auch besser. Dieser Codec wird auch bei UMTS eingesetzt. Leider ist dieser aber auch nicht frei.
Was spricht gegen Speex-Wideband?

Es gibt da noch einen anderen Codec namens Broadvoice: http://www.broadcom.com/support/broadvoice/
Derzeit ist jedoch nur G.722 soweit verbreitet, dass man auch die Chance hat eine Gegenstelle dafür zu finden.
Kennst du eigentlich einen öffentlichen SIP-Registrar der SDP zu den Endgeräten "durchreicht", so dass diese direkt RTP miteinander sprechen und somit auch Codecs nicht gefiltert werden?

Solange diese Situation so bleibt, sehe ich keinen Grund neue Codecs aufzunehmen - vor allem Lizenzpflichtige.