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Q: Relaying telecoms protocol-specific information SIP VoIP calls ( No Answer,   1 Comment )
Question  
Subject: Relaying telecoms protocol-specific information SIP VoIP calls
Category: Computers > Algorithms
Asked by: lanhamster-ga
List Price: $40.00
Posted: 21 Mar 2005 08:13 PST
Expires: 30 Mar 2005 14:42 PST
Question ID: 498008
SIP is an extensible, open-standard protocol which is becoming the
de-faco standard for VoIP calls.  SS7 and Q.931 (used in this question
as examples) are telephony protocols used for the routing of ordinary
phone calls over IDSN lines.

The tleephony protocols contain information about the call such as the
calling party (the CLI), the number dialled (the DDI) and then many
and various settings, indicators and flags.  Many of these flags are
protocol-specific.  I'll use an SS7 flag as an example:

  CPC:   Calling party category
         Example value:  "1: Ordinary, (Residential)",
         Default value:  "0: Unknown"

We have a requirement to receive a call from a telco on an SS7 link,
pass it through our VoIP network and pass it back out on another SS7
link.  It is a requirement of the telco that when we route a call in
this way, the resulting call has the same settings as the original
one.

My question is this:  What standards, naming schemes or other
agreements are there on the transmission of such protocol-specific
data in a SIP VoIP call?  Where can I read about them?

It's possible that you might get lucky and find there's an RFC exactly
on this topic, and I've been too lazy to find it.  :-)
Answer  
There is no answer at this time.

Comments  
Subject: Re: Relaying telecoms protocol-specific information SIP VoIP calls
From: jinkspadlock-ga on 29 Mar 2005 15:47 PST
 
This site may answer some of your questions about relaying SS7,
although it looks like you may be in for some hardware...

http://www.voip-info.org/wiki-SS7+Protocol+Converters+and+Gateways

And this may link you to your elusive RFC...

http://www.faqs.org/rfcs/rfc3372.html

Hope this helps in your quest.

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