Howto:SIP Media Negotiation - Details

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Applies To

This information applies to

  • all innovaphone products

V6 Sr1-hotfix2


More Information

font color="red">This information applies to firmware 6.00 sr1-hotfix2 IPxxx[07-60600.18] (or higher)!

Call Setup

Forward Negotiation

  1. INVITE with SDP-Offer
  2. 180 Ringing
  3. 200 OK with SDP-Answer
  4. ACK

Note: 180 Ringing does not contain an SDP-Answer!

Forward Negotiation with Early Media

  1. INVITE with SDP-Offer
  2. 183 Session Progress with SDP-Answer
  3. 180 Ringing with SDP-Answer
  4. 200 OK with SDP-Answer
  5. ACK

Note: 180 Ringing contains an SDP-Answer!

Reverse Negotiation

  1. INVITE
  2. 180 Ringing
  3. 200 OK with SDP-Offer
  4. ACK with SDP-Answer

Reverse Negotiation with Early-Media

  1. INVITE
  2. 183 Session Progress with SDP-Offer
  3. PRACK with SDP-Answer
  4. 180 Ringing with SDP-Offer
  5. PRACK with SDP-Answer
  6. 200 OK with SDP-Offer
  7. ACK with SDP-Answer

Re-Negotiation on an established call

Forward Negotiation

  1. INVITE with SDP-Offer
  2. 200 OK with SDP-Answer
  3. ACK

Reverse Negotiation

  1. INVITE
  2. 200 OK with SDP-Offer
  3. ACK with SDP-Answer


Howto:SIP Reverse Negotiation - Call Transfer

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