SDP. SDP shall be supported as defined in RFC 2327 [6] and RFC 3264 [7]. This profile shall support mid-call bearer change. It is recommended that this is performed via the UPDATE method.
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SDP. SDP shall be supported as defined in RFC 2327 [6] and RFC 3264 [7]. This profile shall support mid-call bearer change. It is recommended that this is performed via the UPDATE method, although the re-INVITE method shall also be supported.
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Sources: Implementation Agreement