Examples and Explanations
The following sections illustrate scenarios of various levels of complexity.
Basic Scenarios illustrate default-based offer/answer exchanges. In the absence of explicitly configured AMR/AMR-WB octet-align parameter in the original offer or answer, both the initiator and the responder opt for bandwidth efficient payload format. In a similar fashion, the absence of an AMR/AMR-WB mode-set parameter indicates mutual acceptance of the inclusive mode-set (0,1,2,3,4,5,6,7). This section also includes examples of intersecting mode-sets.
Advanced Scenarios illustrate offer/answer exchanges that contain AMR or AMR-WB mode-set parameters.
SDP examples contain rtpmap and fmtp attributes whose syntax is described in the following two sections.