You can found our contact details including fax number from:
Where should we fax or email the contributor agreement?
So far, only mandatories ciphers are implemented in bzrtp. However as you noticed, adding new ciphering suite is doable.
We would be pleased to review your patches and to integrate them into MS2 if relevant. Note we will also ask you to sign our contributor agreement (http://www.belledonne-communications.com/downloads/Belledonne_communications_CA.pdf).
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