View source for IS-41

{{More citations needed|date=February 2023}}
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'''IS-41''', also known as '''ANSI-41''',<ref>{{cite book | author1 = Paul Goransson | author2 = Raymond Greenlaw | date =2011 | title = Secure Roaming in 802.11 Networks | publisher = [[George Newnes Ltd|Newnes]] | pages = 39– | isbn = 978-0-08-054894-4 | url = https://books.google.com/books?id=797lqT4MxusC&pg=PA39}}</ref> is a mobile, cellular telecommunications system [[technical standard|standard]] to support mobility management by enabling the networking of [[Mobile Switching Center#Mobile Switching Centre .28MSC.29|switches]]. ANSI-41 is the standard now approved for use as the network-side companion to the wireless-side [[Advanced Mobile Phone System|AMPS]] (analog), IS-136 ([[Digital AMPS]]), [[cdmaOne]], and [[CDMA2000]] networks. It competes with [[GSM]] MAP, but the two will eventually merge{{Citation needed|date=July 2009}} to support worldwide roaming.

IS-41 facilitates inter-switch operations like handoff and roaming authentication. IS-41 evolved through revisions 0, A, B, C, D, and E with increasingly robust and distributed call processing between switches and their roamer databases. To describe IS-41 messaging requires special terminology to designate the telephone call's originating and terminating switch, called an MSC (anchor-MSC, candidate-MSC, homing-MSC, serving MSC and target MSC) and databases called VLR and HLR.  For handoffs the messaging is between switches.  For roaming and authentication, the messaging would include an HLR and a VLR.  In both cases, the [[PSTN]] may be needed to carry messaging.

==References==
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[[Category:Mobile telecommunications standards]]


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