Howto:SIP Media Negotiation - Details

Applies To

This information applies to

• all innovaphone products

V6 Sr1-hotfix2

More Information

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
5. PRACK
6. 200 OK with SDP-Offer
7. ACK

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

Related Articles

Howto:SIP Reverse Negotiation - Call Transfer

Howto:Supported SIP Features and List of RFC's

Howto:Does the innovaphone IP200 support RFC 3261 aka SIP?