Re: SIGTRAN: Client-Server model

Thanks Chris, thanks Saurabh.

Your mails have brought in a lot of clarity. Was a very fundamental question, thanks for anwering in such a lucid way.


Regards,
Aditi Nangia Someshwar

-----Original Message-----
From: Saurabh Jain <[email protected]>
Date: Fri, 6 Apr 2012 09:34:51 
To: Chris Benson<[email protected]>; aditi someshwar<[email protected]>
Cc: [email protected]<[email protected]>
Subject: RE: [Sigtran] SIGTRAN: Client-Server model

Hello,
In addition to this, in general Sigtran protocols support 2 modes
1. ASP mode -  one side is running on SG and one side is in IP network. Here, protocol at both ends are asymmetric and client server model is a direct fit
2. IPSP mode - both sides are in IP network, Here the protocol is symmetric at both sides and any side can initiate a connection.

Rgds
Saurabh

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Chris Benson
Sent: Thursday, April 05, 2012 10:49 PM
To: aditi someshwar
Cc: [email protected]
Subject: Re: [Sigtran] SIGTRAN: Client-Server model

Aditi,

The function of "client" and "server" that is used by SIGTRAN is the initiator of connections between them. The "client"
decides to connect to a "server" that is listening for such connection requests.

In almost all real cases of SIGTRAN, the underlying transport is provided by SCTP, where a connection is called an association and must be initiated by just one side, with suitable responses by the other side.

In their original guise and purpose, many SIGTRAN protocols are inherently asymmetric, connecting user-level protocols on one side to provider-level protocols on the other side of a pair of co-operating peers. So two "peers" are often not "equal peers" in the sense of being equivalent in operation.

Generally, the "client" and "server" label distinction only applies to the connection phase, and is not relevant after connecting.  Your question refers to *all* functions of "client"
and "server". I believe the initiator and listener/responder roles at connection time are the only such function recognized in the SIGTRAN suite of protocols.

With thanks, from Chris Benson.

On Thu, 5 Apr 2012, aditi someshwar wrote:

>>  Date: Thu, 5 Apr 2012 11:59:56 +0530
>>  From: aditi someshwar <[email protected]>
>>  To: Elnur Atakishiyev <[email protected]>
>>  Cc: "[email protected]" <[email protected]>
>>  Subject: Re: [Sigtran] SIGTRAN: Client-Server model
>>
>>  True, but does it mean that all functions of the "client" and
>> "server" are  applicable to SIGTRAN?
>>  Why can't they be peer to peer nodes?
>>
>>  On Thu, Apr 5, 2012 at 11:55 AM, Elnur Atakishiyev
>>  <[email protected]>wrote:
>>
>>  >  Hi Aditi,****
>>  >
>>  > This is because of Sigtran is based on IP protocol and for two
>> nodes  > interconnection between each other one of them must be act
>> as “SERVER” and  > other one is must be acted as “CLIENT”.****  >  >
>> ** **  >  > ** **  >  > [image: Description:
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>>  > ** **
>>  >
>>  > ** **
>>  >
>>  > *From:* [email protected] [mailto:[email protected]]
>> *On  > Behalf Of *aditi someshwar  > *Sent:* Thursday, April 05, 2012
>> 10:46 AM  > *To:* [email protected]  > *Subject:* [Sigtran] SIGTRAN:
>> Client-Server model****  >  > ** **  >  > Hi all,  >  > One very
>> fundamental question:
>>  >
>>  > SIGTRAN uses "Client-Server" model.
>>  >
>>  > Can anyone please tell why?
>>  >
>>  > Regards,
>>  > Aditi****
>>  >
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