What is Early offer and Late offer in SIP?

Question

Accepted Answer

Early offer and Late offer are two negotiation methods used in Session Initiation Protocol (SIP) for establishing a media session.

Early offer is when the caller includes the media capabilities in the initial INVITE message.
Late offer is when the caller waits until the 200 OK response to include the media capabilities.
Early offer allows the callee to make an informed decision about the media session upfront.
Late offer allows the callee to negotiate the media session parameters before accepting the call.
Early offer can reduce call setup time but may result in more signaling traffic.
Late offer can reduce signaling traffic but may increase call setup time.
Early offer is commonly used in SIP-to-SIP calls, while late offer is used in SIP-to-PSTN calls.

Accepted Answer

Early offer means SDP in the INVITE. ... With late offer, there is no SDP in the INVITE request.

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