RFC 文档RFC 3264 - An Offer/Answer Model with the Session Description Protocol (SDP)10. 示例 Offer/Answer 交换本页总览10. Example Offer/Answer Exchanges (示例 Offer/Answer 交换)10. Example Offer/Answer Exchanges (示例 Offer/Answer 交换) 本节给出若干 offer/answer 交换的示例. Contents 10.1 Basic Exchange (基本交换) 10.2 One of N Codec Selection (N 选 1 编解码器选择)