qr code c# free The SIP REFER Method in VS .NET

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The SIP REFER Method
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Like many of the proposed SIP extensions, the REFER method is currently documented within the IETF in the form of an Internet draft This particular SIP extension, however, is extremely popular and has been implemented in many SIP devices A REFER request enables the sender of the request to instruct the receiver to contact a third party, with the contact details for the third party included within the REFER request A common application of the REFER method is in Call Transfer applications Imagine, for example, that Joe and Mary are having a conversation Mary determines that Joe really needs to talk to Susan and decides to transfer the call to Susan Mary would send a REFER message to Joe, with Susan s contact details contained with a new Refer-to: header field, and Joe
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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The Session Initiation Protocol (SIP)
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Figure 5-19 SIP MESSAGE method for instant messaging
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Boss <Manager@pc1homenet> sip:Serverworkcom
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Daniel <sip:Collins@station1workcom>
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MESSAGE sip:Collins@workcom SIP/20 Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 Max-Forwards: 70 From: Boss<sip:Manager@homenet> To: Daniel<sip:Collins@workcom> Call-ID: 123456@pc1homenet CSeq: 1 MESSAGE Content-Type: text/plain Content-Length: 19 Content-Disposition: render Hello How are you
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MESSAGE sip:Collins@station1workcom SIP/20 Via: SIP/20/UDP serverworkcom; branch=z9hG4bKxyz1 Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 Max-Forwards: 69 From: Boss<sip:Manager@homenet> To: Daniel<sip:Collins@workcom> Call-ID: 123456@pc1homenet CSeq: 1 MESSAGE Content-Type: text/plain Content-Length: 19 Content-Disposition: render Hello How are you
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SIP/20 200 OK Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 From: Boss<sip:Manager@homenet> To: Daniel<sip:Collins@workcom> Call-ID: 123456@station1homenet CSeq: 1 MESSAGE Content-length: 0 SIP/20 200 OK Via: SIP/20/UDP serverworkcom; branch=z9hG4bKxyz1 Via: SIP/20/UDP pc1homenet; branch=z9hG4bK7890 From: Boss<sip:Manager@homenet> To: Daniel<sip:Collins@workcom> Call-ID: 123456@pc1homenet CSeq: 1 MESSAGE Content-length: 0
MESSAGE sip:Manager@homenet SIP/20 Via: SIP/20/UDP serverworkcom; branch=z9hG4bKabcd Via: SIP/20/UDP station1workcom; branch=z9hG4bK123 Max-Forwards: 69 From: Daniel<sip:Collins@workcom> To: Boss<sip:Manager@homenet> Call-ID: 456789@station1workcom CSeq: 1101 MESSAGE Content-Type: text/plain Content-Length: 22 Content-Disposition: render I'm fine How are you
MESSAGE sip:Manager@homenet SIP/20 Via: SIP/20/UDP station1workcom; branch=z9hG4bK123 Max-Forwards: 70 From: Daniel<sip:Collins@workcom> To: Boss<sip:Manager@homenet> Call-ID: 456789@station1workcom CSeq: 1101 MESSAGE Content-Type: text/plain Content-Length: 22 Content-Dispositin: render I'm fine How are you
SIP/20 200 OK Via: SIP/20/UDP serverworkcom; branch=z9hG4bKabcd Via: SIP/20/UDP station1workcom; branch=z9hG4bK123 From: Daniel<sip:Collins@workcom> To: Boss<sip:Manager@homenet> Call-ID: 456789@station1workcom CSeq: 1101 MESSAGE Content-length: 0
SIP/20 200 OK Via: SIP/20/UDP station1workcom; branch=z9hG4bK123 From: Daniel<sip:Collins@workcom> To: Boss<sip:Manager@homenet> Call-ID: 456789@station1workcom CSeq: 1101 MESSAGE Content-length: 0
can then contact Susan Moreover, the REFER method can be interpreted as an implicit SUBSCRIBE request, so that Joe can subsequently send a NOTIFY request to Mary to indicate whether he was able to successfully contact Susan Figure 5-20 shows an example of the use of the REFER method
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The Session Initiation Protocol (SIP)
The Session Initiation Protocol (SIP)
sip:Mary@station1workcom sip:Joe@station2workcom
sip:Susan@station3workcom
Figure 5-20 Usage of the SIP REFER method
REFER sip:Joe@station2workcom SIP/20 Via: SIP/20/UDP station1workcom; branch=z9hG4bK789 Max-Forwards: 70 From: Mary<sip:Mary@workcom>; tag=123456 To: Joe<sip:Joe@workcom>; tag=67890 Contact: Mary<Mary@station1workcom> Refer-To: Susan<sip:Susan@station3workcom> Call-ID: 123456@station1workcom CSeq: 123 REFER Content-Length: 0 SIP/20 202 Accepted Via: SIP/20/UDP station1workcom; branch=z9hG4bK789 From: Mary<sip:Mary@workcom>; tag=123456 To: Joe<sip:Joe@workcom>; tag=67890 Contact: Joe<Joe@station2workcom> Call-ID: 123456@station1workcom CSeq: 123 REFER Content-Length: 0
INVITE sip:Susan@station3workcom SIP/20 Via: SIP/20/UDP station2workcom; branch=z9hG4bKxyz1 Max-Forwards: 70 From: Joe<sip:Joe@workcom>; tag=abcxyz To: Susan<sip:Susan@station3workcom> Contact: Joe<sip:Joe@station2workcom> Call-ID: 67890@station2workcom CSeq: 567 INVITE Content-Type: application/sdp Content-Length: xx Content-Disposition: session {message body} SIP/20 200 OK Via: SIP/20/UDP station2workcom; branch=z9hG4bKxyz1 From: Joe<sip:Joe@workcom>; tag=abcxyz To: Susan<sip:Susan@station3workcom>; tag=123xyz Call-ID: 67890@station2workcom CSeq: 567 INVITE Content-Type: application/sdp Content-Length: xx Content-Disposition: session {message body} ACK sip:Susan@station3workcom SIP/20 Via: SIP/20/UDP station2workcom; branch=z9hG4bKxyz1 Max-Forwards: 70 From: Joe<sip:Joe@workcom>; tag=abcxyz To: Susan<sip:Susan@station3workcom>; tag=123xyz Call-ID: 67890@station2workcom CSeq: 567 ACK Content-Length: 0
NOTIFY sip:Mary@station1workcom SIP/20 Via: SIP/20/UDP station2workcom; branch=z9hG4bK123 Max-Forwards: 70 To: Joe<sip:Joe@workcom>; tag=67890 From: Mary<sip:Mary@workcom>; tag=123456 Contact: Joe<sip:Joe@station2workcom> Call-ID: 123456@station1workcom CSeq: 124 NOTIFY Content-Type: message/sipfrag;version=20 Content-Length: 15 SIP/20 200 OK
SIP/20 200 OK Via: SIP/20/UDP station2workcom; branch=z9hG4bK123 To: Joe<sip:Joe@workcom>; tag=67890 From: Mary<sip:Mary@workcom>; tag=123456 Call-ID: 123456@station1workcom CSeq: 124 NOTIFY Content-Length: 0
In Figure 5-20, the REFER and NOTIFY requests between Mary and Joe are sent within an established dialog Once Joe receives the REFER request from Mary, he issues a 202 (accepted) response This is a new status code that is not defined in the base SIP specification, but it is specified in several
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The Session Initiation Protocol (SIP)
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