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When a session is modified, the following rules must be followed: 

1. The origin (o=) line version number must either be the same as the last one sent, which indicates that this SDP is identical to the previous exchange, or it may be incremented by one, which indicates new SDP that must be parsed. 

2. The offer must include all existing media lines and they must be sent in the same order. 

3. Additional media streams can be added to the end of the m= line list. 

4. An existing media stream can be deleted by setting the port number to 0. This media line must remain in the SDP and all future offer/answer exchanges for this session. 

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