UC 500 supports majority of those, although I cannot express direct compliance for each of those individually. If you can provide me with the specifications of the SIP trunk (whether it requires registration), what type of codec, what type of DTMF method, I should be able to generate a template for CCA which you should be able to use to configure SIP trunking for this customer.
It would seem that your ITSP supports only G.711 Codec, this means you will need to change your voice-class Codec priority to have G.711 as number 1 and or the only one. Otherwise you could ask them to support G.729 as well.
If they only support one type of Codec then you need to make sure your Dial-Peer has this as well, this way all the information such as DTMF are all going to work as they should.
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