Call Hold SIP Service Example

25/02/2015 CallHoldSIPServiceexample

http://www.in2eps.com/fosip/tkfosipservice01.html 1/12

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Illustration of the SIP Service examples documented in RFC 5359

01. Call Hold

This example is documented in RFC 5359 section2.1

Prev Next Start Reader's guide

01. Call Hold

02. Consultation Hold

03. Music On Hold

04. Transfer: Unattended

05. Transfer: Attended

06. Transfer: Instant Messaging

07. Call Forwarding Unconditional

08. Call Forwarding Busy

09. Call Forwarding No Answer

10. 3Way Conference: 3rd Party is Added

11. 3Way Conference: 3rd Party Joins

12. FindMe

13. Call Management: Incoming Call Screening

14. Call Management: Outgoing Call Screening

15. Call Park

16. Call Pickup

17. Automatic Redial

18. Click to Dial

19. Music on Hold as per RFC 7088

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In this scenario, Alice calls Bob, then Bob places the call on hold. Bob then takes the call off hold, then Alice hangs up thecall. Note that hold is unidirectional in nature. However, a UA that places the other party on hold will generally also stopsending media, resulting in no media exchange between the UAs. Older UAs may set the connection address to 0.0.0.0 wheninitiating hold. However, this behavior has been deprecated in favor or using the a=inactive SDP attribute if no media is sent,or the a=sendonly attribute if media is still sent.

Call Hold

Top Up 1. INVITE (A2B) 2. 180 Ringing 3. 200 OK 4. ACK (A2B) 5. INVITE (B2A hold) 6. 202 OK 7. ACK (B2A)

Prev Next 8. INVITE (B2A) 9. 200 OK 10. ACK (B2A) 11. BYE (A2B) 12. 200 OK

1) SIP INVITE request: from Alice to Bob

Call Hold



2) SIP 180 Ringing response: from Bob to Alice



Call Hold



3) SIP 200 OK response: from Bob to Alice



Call Hold



4) SIP ACK request: from Alice to Bob



Call Hold



5) SIP INVITE (hold) request: from Bob to Alice

Note the use of the rendering feature tag defined in RFC 4235, clause 5.2 to indicate that Bob's UA is no longer renderingmedia to Bob, i.e., that Bob has placed the call on hold.

Call Hold



6) SIP 200 OK response: from Alice to Bob

http://www.in2eps.com/y40/tk-ietf-rfc-4235.html#e-5-2



Call Hold



7) SIP ACK request: from Bob to Alice



Call Hold



8) SIP INVITE (off hold) request: from Bob to Alice



Call Hold



9) SIP 200 OK response: from Alice to Bob

Call Hold



10) SIP ACK request: from Bob to Alice



Call Hold



11) SIP BYE request: from Alice to Bob



Call Hold



12) SIP 200 OK response: from Bob to Alice

Call Hold SIP Service Example

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