Firstable I want to tell you that I'm able to call Betamax users by their 'username' by setting up Dial Plans on voxalot rather than speed dial. A courios behavior I found is by using SjPhone connected to my voxalot account I can call Betamax via sip uri syntax. Putting the same syntax as voxalot speed dial entry it doesn't work. So the solution I adopted was Dial Plan.
After that I setup codec G729 (on all the preferred codec my device can configure) for communication to voxalot (eu server) and G729;alaw;ulaw;G723;G726; (...) as codecs to call Betamax.
I strongly suggest to you to set G711 (alaw;ulaw) as second preferred Betamax codec becouse often Betamax negotiates ilbc or GSM. Depend to which voxalot server you are connected to set ulaw or alaw first. Usually for european server alaw is working better than ulaw but for us or au ulaw is the best one (as per Cisco dictat!!!).
Ciao
Paolo
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