Stumer, Peggy (Com US) wrote:
> Is there any way to communicate this in SIP in a standardized way? If
> not, should there be, or, crap shoot?
Since Alert-Info is usually carried in the first INVITE message and
expected to be acted on immediately by the recipient, there is no
obvious and simple way to negotiate this.
A straightforward way to handle would be to define a new option tag and
include it in a Require header. That would make the call fail if it
isn't supported at the other end. But that isn't always a good option.
Or you can use if the semantics you intend are in fact optional, so that
reasonable things happen if the callee ignores this.
And of course you can use this in controlled environments where the one
inserting the header knows the recipient will understand it. For
instance this makes sense when a device connects to the network through
an edge proxy that supports and protects it. That edge proxy might
insert an Alert-Info with various values depending on who is calling.
Paul
> -----Original Message-----
> From: Paul Kyzivat [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, June 21, 2006 2:53 PM
> To: Steve Langstaff
> Cc: Stumer, Peggy (Com US); [email protected]
> Subject: Re: [Sip-implementors] Alert-INFO - no ringing at destination
>
>
>
> Steve Langstaff wrote:
>> I've seen alert-info with 'info=alert-visual' used for silent ringing,
> but don't know how standard it is.
>
> AFAIK, *nothing* about the use of alert-info is standard. Honoring it is
>
> optional. What (if any) forms of parameters might be honored is a crap
> shoot.
>
> IMO there are number of useful applications for Alert-Info but they
> would require further standardization to be generally useful.
>
> Paul
>
>>> -----Original Message-----
>>> From: [EMAIL PROTECTED]
>>> [mailto:[EMAIL PROTECTED] Behalf Of Stumer,
>>> Peggy (Com US)
>>> Sent: 21 June 2006 13:56
>>> To: [email protected]
>>> Subject: [Sip-implementors] Alert-INFO - no ringing at destination
>>>
>>>
>>> Hi all,
>>> Is there a standardized way to indicate to the receiving device to
> NOT
>>> provide ringing? I don't want to send a wav file with silence.
>>> Thanks
>>>
>>> Best Regards,
>>> Peggy
>>>
>>>
>>>
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>
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