Re: [Sipping] SIP method for sending telephony signals

[Dean Willis <dean.willis at softarmor.com>]

On May 3, 2007, at 11:12 AM, Mohana Sundaram wrote:

> Hi All,
>
> Is there any standard for sending telephony signals(like onhook/ 
> offhook ) and telephony tones through SIP.
>
> A quick look at kpml standard RFC4730 seems to me like it is only  
> for sending DTMF digits.

Nope. It does suggest mapping flash to R.

But in my experience, if you think you need to send "flash" over SIP,  
then you probably shouldn't be using SIP. You should be using MGCP or  
some other stimulus-response protocol.

The hook operation should change state in the local user interface,  
not communicate a state change to a remote softswitch.

Why do people keep trying to slavishly replicate PSTN behavior using  
SIP? Can't they just use the PSTN if that's what they want?

--
Dean




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