[Sip-implementors] Please clarify

[priya]

Dear All,   I would like to know how to specify the payload and its attributes when I want to specify only the encoder or the decoder alone. The standard payload types , I believe is for the Full Duplex codecs. so can I use the sendonly and recvonly attributes to specify which codec type?   eg.   m = audio 2345 RTP/AVP 2 a=sendonly     In this case , I am trying to specify the Encoder type for G721.   If this approach is wrong , I would like to know how to specify.   Thanking you, With Regards, Priya