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1.	Image from Amazon.com	SIP: Understanding the Session Initiation Protocol, Third Edition by Johnston, Alan B Series: Artech House Telecommunications Series Edition: 3rd ed Material type: Computer file; Format: electronic Language: English Publication details: Artech House ; 2009 Online resources: Click here to access online Availability: Items available for reference: EBOOKS-EBSCO ACADEMIC COLLECTION: Not for loan (1). Save to lists Add to cart (remove)
2.	Image from Amazon.com	Understanding Voice Over IP Security by Johnston, Alan B.-Piscitello, David M Series: Artech House Telecommunications Library Material type: Computer file; Format: electronic Language: English Publication details: Artech House ; 2006 Online resources: Click here to access online Availability: Items available for reference: EBOOKS-EBSCO ACADEMIC COLLECTION: Not for loan (1). Save to lists Add to cart (remove)
3.	Image from Amazon.com	SIP: Understanding the Session Initiation Protocol, Second Edition by Johnston, Alan B Series: Artech House Telecommunications Library Edition: 2nd ed Material type: Computer file; Format: electronic Language: English Publication details: Artech House ; 2004 Online resources: Click here to access online Availability: Items available for reference: EBOOKS-EBSCO ACADEMIC COLLECTION: Not for loan (1). Save to lists Add to cart (remove)
4.	Image from Amazon.com	SIP: Understanding the Session Initiation Protocol by Johnston, Alan B Series: Artech House Telecommunications Library Material type: Computer file; Format: electronic Language: English Publication details: Artech House ; 2001 Online resources: Click here to access online Availability: Items available for reference: EBOOKS-EBSCO ACADEMIC COLLECTION: Not for loan (1). Save to lists Add to cart (remove)