[SIPForum-techwg] IP PBX section 15

[Paul Kyzivat]

Why is dead silence not an option? The 180 says the other end is 
alerting and so it is appropriate to play ringback. All 183 says is that 
the other end is thinking about it - there is no guarantee what it will 
do. If it happens to be accompanied by inband audio then it is fine to 
play that. Otherwise you have no clue and ought not to be playing ringback.

(I guess you might play out the sound of relays clicking - indicating 
"progress". Or of you have a GUI you could display a spinner.)

	Paul

Francois Audet wrote:
> Sorry, "out-of-band" tone.
> 
> 
>>-----Original Message-----
>>From: techwg-bounces at sipforum.org 
>>[mailto:techwg-bounces at sipforum.org] On Behalf Of Audet, 
>>Francois [SC100:9T51:EXCH]
>>Sent: Tuesday, January 10, 2006 10:15
>>To: Mcmillen, C Joanne (Joanne); Elwell, John; SIP Forum Tech WG
>>Cc: Chris Sibley
>>Subject: RE: [SIPForum-techwg] IP PBX section 15
>>
>>
>>You need to alert with whatever outbound tone you want.
>>
>>Dead silence is not an option.
>>
>>
>>
>>
>>>-----Original Message-----
>>>From: Mcmillen, C Joanne (Joanne) [mailto:joanne at avaya.com]
>>>Sent: Tuesday, January 10, 2006 10:10
>>>To: Audet, Francois [SC100:9T51:EXCH]; Elwell, John; SIP 
>>
>>Forum Tech WG
>>
>>>Cc: Chris Sibley
>>>Subject: RE: [SIPForum-techwg] IP PBX section 15
>>>
>>>
>>>Well, I agree with John - I don't think ringing is
>>>appropriate for anything except 180.
>>>
>>>-----Original Message-----
>>>From: techwg-bounces at sipforum.org 
>>
>>[mailto:techwg-bounces at sipforum.org]
>>
>>>On Behalf Of Francois Audet
>>>Sent: Tuesday, January 10, 2006 9:43 AM
>>>To: Elwell, John; SIP Forum Tech WG
>>>Cc: Chris Sibley
>>>Subject: RE: [SIPForum-techwg] IP PBX section 15
>>>
>>>My point is that if you receive 183 (or anything else)
>>>without an SDP, then you can't do inband ringing.
>>>
>>>
>>>>-----Original Message-----
>>>>From: Elwell, John [mailto:john.elwell at siemens.com]
>>>>Sent: Monday, January 09, 2006 23:52
>>>>To: Audet, Francois [SC100:9T51:EXCH]; SIP Forum Tech WG
>>>>Cc: Chris Sibley
>>>>Subject: RE: [SIPForum-techwg] IP PBX section 15
>>>>
>>>>
>>>>Francois
>>>>
>>>>You wrote:
>>>>
>>>>>15.1
>>>>>
>>>>>There needs to be an explanation that receiving 183
>>>
>>>without and SDP
>>>
>>>>>should trigger Ringing tone (or in fact, any 18X without SDP).
>>>>>
>>>>
>>>>First, 180 should lead to ringback tone, but I don't 
>>
>>think any other 
>>
>>>>18x should. Secondly, this should be independent of whether
>>>
>>>there is
>>>
>>>>SDP present. It should, of course, be dependent on whether
>>>
>>>RTP/SRTP is
>>>
>>>
>>>>being received.
>>>>
>>>>John
>>>>
>>>>
>>>
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>>
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> 
> 
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