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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
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
2) SIP 180 Ringing response: from Bob to Alice
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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
3) SIP 200 OK response: from Bob to Alice
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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
4) SIP ACK request: from Alice to Bob
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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
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
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
6) SIP 200 OK response: from Alice to Bob
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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
7) SIP ACK request: from Bob to Alice
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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
8) SIP INVITE (off hold) request: from Bob to Alice
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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
9) SIP 200 OK response: from Alice to Bob
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
10) SIP ACK request: from Bob to Alice
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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
11) SIP BYE request: from Alice to Bob
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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
12) SIP 200 OK response: from Bob to Alice
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