Re: [stir] current draft charter

[Hadriel Kaplan <[e-mail]>]

On Jun 16, 2013, at 7:27 PM, "Peterson, Jon" <[e-mail]> wrote:

> The exact amount of tolerable delay is a very interesting dimension of
> this problem space. I suspect we have a considerable amount of time, given
> all the human expectations about both post-dial delay and the wait for
> someone to pick up after altering. I think it's enough time to perform
> some non-trivial operations.

I've been thinking about that and I'm not sure we actually have much time.  I've been looking at what the CNAM guys are doing, and at least one them (used in a large mobile provider) goes so far as to sometimes skip it on the INVITE and send their CNAM info in an UPDATE or INFO afterwards due to the delay.  I.e., they have us queue the INVITE while they retrieve the CNAM info for the given caller-id, but if they take too long then we send the INVITE and send their results separately afterwards in another message.  Another operator that uses private ENUM for CNAM querying also sets very low timeouts on the query, and just don't provide a calling name if it times out (ie., the INVITE gets sent on without it, and nothing updates it later).

Also, Brian at one point mentioned transit providers possibly doing the verification check as well, and that might be difficult if it takes non-trivial time I think, because one of the SLA measurements they get ranked on is how fast they route their calls onward.  (Besides which they're never involved this type of stuff so I'd doubt they'd start now anyway.)

Anecdotally, I find that intra-nation calls get to ringing stage much faster than international calls, so people are probably ok with international caller-id verification taking longer.

-hadriel