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Multi Address Appearance on OpenStage
 
00.00.2007    I    2 
 
Disclaimer 
 
This document contains information on multiple address appearance on OpenStage 
phone. It raises no claims to completeness. 
 
 
Disambiguation 
 
 
This document describes Multiple Address Appearance (MAA) for Open-
Stage@Asterisk. The Telecommunication Industry Association (TIA) has defined 
terms for VoIP telephony features [1] which slightly differ from the Siemens Enter-
prise Communications (SEN) wording. This has historical reasons. As SEN uses the 
terms consistently in every kind of documentation, this document will also use the 
SEN wording. The following terms are affected: 
 
¾ 
Multiple Address Appearance (MAA) 
¾ 
Multiple Line Appearance (MLA) 
¾ 
Multiple Station Appearance (MSA) 
 
The following table gives an overview about the differences: 
 
Term 
(SEN) 
Meaning Term 
(TIA) 
MAA/ 
MLA 
Private 
line 
type 
The Multiple Address Appearance feature, also commonly 
known as "Multiple Line Appearance", provides the served user 
with multiple addresses appearing on a single telephone. The 
served user has the ability to originate, receive and otherwise 
control calls on each of these address appearances. These ad-
dress appearances behave independently of each other. 
MAA/ 
Keyset 
MSA 
Shared 
line 
type 
Multiple Station Appearance provides the ability for the same 
address (e.g. telephone number, DNS name, URL) to appear on 
multiple telephones. Users at each telephone may be provided 
with the ability to make, answer, share and otherwise manipu-
late calls on the affected telephones. 
MLA
MSA 
 
The main difference is the usage of the term “Multiple Line Appearance”; SEN uses 
MLA for MSA too, whereas TIA uses MLA together with MAA.