[LINK] QSIG - SIP - Ecma draft standard
Tom Worthington
Tom.Worthington at tomw.net.au
Mon Dec 10 08:40:08 AEDT 2007
At 08:39 AM 8/12/2007, Marghanita da Cruz wrote:
>Can any linkers throw light or wish to express an opinion on this
>
>>... First draft on signalling interworking between QSIG and SIP ...
><http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-361.pdf>
According to the Wikipedia: "QSIG is an ISDN
based signaling protocol for signaling between
private branch exchanges (PBXs) in a Private
Integrated Services Network (PISN). It makes use
of the connection-level Q.931 protocol and the
application-level ROSE protocol. ISDN "proper"
functions as the physical link layer. ..." <http://en.wikipedia.org/wiki/QSIG>.
SIP is " The Session Initiation Protocol (SIP) is
an application-layer control (signaling) protocol
for creating, modifying, and terminating sessions
with one or more participants. It can be used to
create two-party, multiparty, or multicast
sessions that include Internet telephone calls,
multimedia distribution, and multimedia
conferences. (cit. RFC 3261)."
<http://en.wikipedia.org/wiki/Session_Initiation_Protocol>.
There are thousands of web pages discussing
problems with the complexities of QSIG and SIP
<http://www.google.com.au/search?q=qsig+sip+problem>.
If you want to connect some IP phones, then one
way would be to use Asterisk
<http://www.asterisk.org/>. The computer running
the Asterisk system does not need to have a high
power processor, as it is not processing the digitized voice.
There is a good overview of the issues, with an
explanation of QSIG in "INTERCONNEXION DE
COMMUTATEURS HARDWARE ET SOFTWARE POUR LA
TÉLÉPHONIE IP.
"<http://www.student.montefiore.ulg.ac.be/~meessenn/tfe/tfe-pbx-meessen-cc.pdf>.
Don't be put off by the French at the beginning,
it changes to English after the introduction.
There are more specific technical documents
available such as "Cisco Unified CallManager
4.0-PBX Interoperability: Ericsson MD ..."
<http://www.cisco.com/application/pdf/en/us/guest/products/ps6884/c1237/ccmigration_09186a00801e6339.pdf>.
However, even connecting two devices from the
same manufacturer, can be a problem:
<http://www.pbxinfo.com/businessphone/27089-q-sig-problem-ericsson-bp250.html>.
Tom Worthington FACS HLM tom.worthington at tomw.net.au Ph: 0419 496150
Director, Tomw Communications Pty Ltd ABN: 17 088 714 309
PO Box 13, Belconnen ACT 2617 http://www.tomw.net.au/
Adjunct Senior Lecturer, ANU
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