Subject: RE: [Sip] A sips: trial balloon for you to shoot down

From: "Sanjay Sinha \(sanjsinh\)" <[email-masked]>
Date: Tue, 31 Oct 2006 16:12:38 -0500

>-----Original Message-----
>From: Dean Willis [mailto:[email-masked]] 
>Sent: Tuesday, October 31, 2006 3:34 PM
>To: Sanjay Sinha (sanjsinh)
>Cc: IETF SIP List
>Subject: Re: [Sip] A sips: trial balloon for you to shoot down
>
>
>On Oct 31, 2006, at 1:00 PM, Sanjay Sinha ((sanjsinh)) wrote:
>
>> Don't like the PSTN gateway limitation. As was mentioned in 
>an earlier 
>> email, if signaling reaches PSTN gateway, it has reached UAS.
>
>But what's the diff between (PSTN gateway, a hunk of PSTN, 
>another PSTN gateway) and an SBC? Both provide the same 
>downgrade attack if we don't have this requirement.

It is my understanding is that SBC is esentially a B2BUA or an IP-IP
gateway, if one leg is SIP and another one is say, H323/MGCP. A pstn
gateway is termination point of IP leg signaling. It will have fxs/pots
or a PBX interface on the other leg. So I can have an IAD with pots
phones hanging off of fxs port in a small branch office and know that
interface is secure/trusted.

Sanjay

>--
>Dean

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