Tuesday 1 August 2017

SIP Early Offer vs Delayed Offer

Early Offer
Initial SIP INVITE is sent with SDP message body. Session initiator allows called device to choose its codec for the session.

Why early media?

The called device might want to establish an early media RTP path to reduce the effect of audio cut-through delay for calls experiencing a long signal delay.
Calling device might want to establish early media RTP path to access DTMF or Voice driven IVR system.

Delayed Offer

Initial SIP message is sent without SDP message body.Session initiator waits for the called device to send capabilities first.
Delayed offer is recommended for SIP trunks.By default, CUCM supports delayed offer. 
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3 comments:

  1. Anonymous20 March 2018 at 16:23

    Hi Nirali,

    Why is "Delay Offer" recommended? just to understand technical reason. Thank you

    ReplyDelete
  2. Anonymous2 August 2018 at 07:48

    Hi,
    Delay Offer provides receiver to the codecs and another parameters to establish session.

    ReplyDelete
    Replies
    1. Anonymous2 August 2018 at 07:50

      Sorry,It is for delay offer

      Delete

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