VoIP phone with certain features

Hi all,

I'm looking for a freely available softphone implementation (for research purposes) which provides as many of the following features as possible:

- SIP-based

- open source

- codecs defined by e.g. ITU-T, ETSI, ...

- both narrowband and wideband codecs

- playback and recording facilities

Of course I'm aware that there is probably no solution that provides the full desired functionality. But I would appreciate any hints that go at least in this direction.

Many thanks

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