Johnston, A. B. (2009). SIP: Understanding the Session Initiation Protocol (3rd ed.). Artech House.
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Chicago-čujuhus (17. p.)
Johnston, Alan B. SIP: Understanding the Session Initiation Protocol. 3rd ed. Boston, Mass.: Artech House, 2009.
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MLA-čujuhus (9. p.)
Johnston, Alan B. SIP: Understanding the Session Initiation Protocol. 3rd ed. Artech House, 2009.
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