this "tandem" is called IP-to-IP Gateway, or BSC - Border Session Controller, in Cisco parlance.
Yes it's supported, however Rb will need to run and IP-to-IP image, which image name ends with _isv, at that point it will be able to connect VoIP even when different signaling protocols are used, and do (some limited) transcoding, plus other things
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You can either use the voice class or transparent. The transparent will use what ever the other ends offers. The voice class will allow you to set a restriction on what codecs to use and it is up to both parties to decide on which to use. One problem with this is that if both parties disagree on codec, then you will get a codec mismatch and the call will be busy out.
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