IVR/CallingCard scenario

["Erwin Davis" <erwin.davis@xxxxxxxxx>]

Hi, Cullen and all,

Thanks for your kind response and attention. Here is the scenario of voicemail (IVR) in IPT, that could be

same as calling card scenario. Please correct me if anything wrong. 

Suppose Alice wants to use IP phone Bob to call his voicemail server Carol.

(1) Alice dials the phone number associated with Carol.
(2) Bob generates an INVITE (IDENTITY, SDES/MIKEY, SDP)
(3) After verifying the asserted IDENTITY. Carol sends back 180 (IDENTITY, SDES/MIKEY, SDP)
(4) Carol again sends early media SRTP("please enter your mail box?") via SRTP based on
     exchanged SDES/MIKEY and media info in SDP
(5) Bob decodes/forwards it and to Alice
(6) Alice presses the voicemail box which is sent by Bob as SRTP(DTMF(5559998888))
(7) Carol again sends another early media SRTP ("please enter your password")
(8) Alice receives the request decoded from Bob and press the password which
    is sent back as SRTP (DTMF(12345678))
(9) Carol receives/verifies the password, and then it sends 200OK to Bob
(10) Bob sends back ACK to sync the establishment of this communication.

(11) Carol forwards the voicemail(s) to Bob/Alice via SRTP. (how the IVR sends

the mail is not clear to me though it may be out of the scope. I would be appreciate

for the further clarification from IVR experts)

 

 

 Thanks and have a nice weekend,

 

e

---------- Forwarded message ----------
From: Cullen Jennings <fluffy@xxxxxxxxx>
Date: Jun 13, 2007 6:24 PM
Subject: Re: Additional use cases? (Re: Plan for moving forward)
To: Erwin Davis <erwin.davis@xxxxxxxxx>
Cc: ietf-rtpsec@xxxxxxx

My apologies if this was already answered but RFC 4733 is typically
used to sent DTMF over RTP. This is widely used and deployed although
there are other approaches for doing DTMF including as audio in the
RTP and ways to do it outside the media path such as RFC 4730.

On Jun 9, 2007, at 3:13 PM, Erwin Davis wrote:

> Hi, folks,
>
> Forgive me as newbbie. Which RFC(s) and draft(s) address the
> mechanism(s) of
> sending calling card info (such as usernames, passwods) as DTMF
> tones in the
> media path and its security mechanims? much appreciated,
>
> Best Regards,
>
> e
>