[Standards-JIG] FW: Jingle - P2P and PBX calls

Simon Guindon simon.guindon at tomahawk.ca
Wed Jan 4 20:34:37 UTC 2006

Right. I think we need a more flexible manner than simply gateway
handling chat msgs and converting them to DTMF though. I think perhaps
an addition to one of the Jingle specs (whichever one it would fall
into, be it Jingle or Jingle Audio) would be cleaner.

As far as I know and any Asterisk/IAX/SIP guys on this list could maybe
correct me if I'm wrong but most PBX-like features are based off of
DTMF. Such as putting someone on hold, transferring the call, or
navigating voice menus and voicemail etc.

To add all these features to Jingle, do we simply just need a way to
send DTMF and all those solutions are now solved?

I'm only familiar with IAX and Asterisk as a client developer and most
of all the things I mentioned work by pressing tones.

Can Jingle support multiple lines? For example in Asterisk I believe I
can have 3 lines associated with my account and I can be in one call,
put them on hold and pickup another call. 

Please correct me if I'm wrong.

Thanks and take care,

Simon Guindon
Tomahawk Technologies Inc.
simon.guindon at tomahawk.ca

-----Original Message-----
From: standards-jig-bounces at jabber.org
[mailto:standards-jig-bounces at jabber.org] On Behalf Of Nolan Eakins
Sent: Wednesday, January 04, 2006 3:06 PM
To: Jabber protocol discussion list
Subject: Re: [Standards-JIG] FW: Jingle - P2P and PBX calls

Steve Kann wrote:
> One question you addressed below was DTMF support:  Firstly, you're
> strictly correct about IAX:  In IAX, there is only one proper way to 
> transport DTMF, and that is as DTMF IAX frames:  It is not proper to 
> send them in-band as audio tones.  With SIP/RTP, there's several 
> different methods in use;  I don't think jingle-audio defines a 
> signaling path for DTMF; that might be something useful.

My idea for DTMF signals was just to send a chat message that contained 
numbers, pounds, and/or asterisks. If I'm making a call to my land line 
(123-555-1234) to check my answering machine through an XMPP to SIP or 
IAX gateway, 1235551234 at pbx.example.com, and needed to send a DTMF "1", 
I would send a message whose body was a "1". The gateway would handle 
the actual tone generation or whatever the gatewayed protocol used.

So this would look like:
   * Start a jingle call to my land line, 1235551234 at pbx.example.com
   * My land line prompts for a 4 digit DTMF password
   * I send:
       <message to="1235551234 at pbx.example.com">
   * The gateway pbx.example.com generates the tones or gatewayed 
protocol elements corresponding to "2325", my password, and sends them 
along. The gateway may also mix in the tones into the audio stream I 
receive too so I know they were generated.

A side benefit is that if the gatewayed protocol can also send textual 
representations of the menu or prompt, then the gateway can send a 
message that contains the menu or prompt. My client would display this 
in a chat window, and it would be like interacting with a typical bot on

the Jabber network.

I'd leave it up to the client implementors whether they want to include 
a GUI keypad or not. I'd prefer seeing a voice call handled in the same 
window as a chat though.

- Nolan

SemanticGap: To act as one (TM) -- http://www.semanticgap.com/
Instant awareness & messaging * Online presence design
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