Code change:
MUST be zero. The application can specify its preferred policy regarding the use of <del> BUNDLE, the multiplexing mechanism defined in RFC8843.  Regardless of policy, the application will always try to negotiate bundle onto a single transport and will offer a single bundle group across all "m=" sections; use of this single transport is contingent upon the answerer accepting bundle.  However, by specifying a policy from the list below, the application can control exactly how aggressively it will try to bundle media streams together, which affects how it will interoperate with a non-bundle-aware endpoint.  When negotiating with a non-bundle-aware endpoint, only the streams not marked as bundle- only streams will be established. </del> <ins> BUNDLE, the multiplexing mechanism defined in I-D.ietf-mmusic- rfc8843-bis.  Regardless of policy, the application will always try to negotiate bundle onto a single transport and will offer a single bundle group across all "m=" sections; use of this single transport is contingent upon the answerer accepting bundle.  However, by specifying a policy from the list below, the application can control exactly how aggressively it will try to bundle media streams together, which affects how it will interoperate with a non-bundle- aware endpoint.  When negotiating with a non-bundle-aware endpoint, only the streams not marked as bundle-only streams will be established. </ins> The set of available policies is as follows:

Related discussion:
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To resolve WGLC comments: URL it was agreed to incorporate a reference to this text in 8843bis: URL That text ended up in s7.6.
When draft-8843bis is given an RFC number, this draft should reference the new RFC. Hi, Eventhough I would not like to make more changes than necessary, I am fine with "3PCC Considerations". However, your suggested text is very difficult to understand in some places, so let me give it a try. (The first paragraph is generic, the second SIP specific, and the third BUNDLE specific.) 3PCC Considerations In some 3PCC scenarios a new session will be established between an endpoint that is currently part of an ongoing session and an endpoint that is currently not part of an ongoing session. The endpoint that is part of a session will generate a subsequent offer that will be forwarded to the other endpoint by a 3PCC controller. The endpoint that is not part of a session will process the offer as an initial offer. The Session Initiation Protocol (SIP) [RFC3261] allows a User Agent Client (UAC) to send a re-INVITE request without an SDP body (sometimes referred to as an empty re-INVITE). In such cases, the User Agent Server (UAS) will include an SDP offer in the associated 200 OK response. If the UAS is a part of an ongoing session, it will include a subsequent offer in the 200 OK response. The offer will be received by a 3PCC controller (UAC) and then forwarded to another User Agent (UA). If the UA is not part of an ongoing session, it will process the offer as an initial offer. When the BUNDLE mechanism is used, an initial BUNDLE offer is constructed using different rules than subsequent BUNDLE offers, and it cannot be assumed that a UA is able to correctly process a subsequent offer as an initial offer. Therefore, the 3PCC controller SHOULD rewrite the subsequent offer into a valid initial offer, following the procedures in (Section 7.2), before it forwards the offer to a UA.