Re: [stir] I-D Action: draft-kaplan-stir-ikes-out-00.txt

[Hadriel Kaplan <[e-mail]>]

On Jul 15, 2013, at 4:05 PM, Torrey Searle <[e-mail]> wrote:

> I really like your draft, especially the fact that inter networks with ss7.  Just have a initial comment that in the case of the UUI header, the spec should probably specify that  the Protocol Discriminator for the UUI header should be set to 00 - User Specific Coding.  Though it might me an interesting question if it is possible to use a new value for the protocol discriminator to easily identify that the value in the UUI header is a signature.

Crap, I forgot about the protocol discriminator.  I don't mean I forgot to mention it, I mean I forgot about the byte it takes, not to mention the type and length bytes.  That means there're only 128 bytes available, which for a 1024-bit private key means all of those 128 bytes will be the signature.  So I'll have to move the key index and timestamp fields into the Call-Reference param instead.  Ugh.

But anyway, yeah good catch, the discriminator should probably be 0x00.


> Also how about the case where [e-mail] gets aliased to an e164 when reaching the pstn gateway?  I assume the pstn gateway would "own" the e164 and can re-sign the call before forwarding, but would it be interesting to mention this case in the spec?

Does that ever happen in the PSTN gateways?  I know it happens in some service providers (like skype for example), but I thought it happened on some SIP or H.323 system just before it reached the PSTN GW.  Regardless, yes I should mention that in the draft too.

Thanks for the feedback!

-hadriel