RE: [Sipping] Sipdev, incoming call alert (ring signal equivalents)

[Henry Sinnreich <[e-mail]>]

> Such external interfaces were normal in the PSTN era. It was 
> easy to buy an extra ringer to place in the garden or in the 
> garage. It was easy to find strong flashing light alerters to 
> place in the factory.

There are now other options, such as cordless phone, alerting devices,
802.11 SIP phones and one imagine also alerting devices that are optical
and wireless.

-Do you really want to propagate the those from the PSTN era?

-Should this really be specified for all SIP phones?

-What about the SIP business phones? (Related I-D)

Henry

> -----Original Message-----
> From: [e-mail] [mailto:[e-mail]] 
> On Behalf Of Gunnar Hellstrom
> Sent: Monday, June 23, 2003 11:56 AM
> To: 'Sipping@Ietf. Org'; [e-mail]; 'Mike Spanner'; 
> 'James Hamlin'; [e-mail]; 
> [e-mail]; [e-mail]; 
> [e-mail]; 'Guido Gybels'; 
> [e-mail]; 'Judy Harkins'; 'Trefor Davies'; Henry Sinnreich
> Cc: [e-mail]; [e-mail]; 
> [e-mail]; [e-mail]
> Subject: [Sipping] Sipdev, incoming call alert (ring signal 
> equivalents)
> 
> 
> In the discussion about the sipdev spec,
> 
> http://www.ietf.org/internet-drafts/draft-sinnreich-sipdev-req
> -01.txt , I had earlier got positive reactions on a proposal:
> 
> In 4.9 Ringer Behaviour  : add the section below for the 
> purpose of people in the garden, in noisy locations, and for 
> the use by deaf, hearing impaired, deaf-blind people.
> 
> "SIP Telephony devices MUST provide an external interface to
> an external alerting system."
> 
> I cannot find much from that proposal in the new wording, so 
> I repeat the proposal a bit more elaborated:
> 
> Such external interfaces were normal in the PSTN era. It was 
> easy to buy an extra ringer to place in the garden or in the 
> garage. It was easy to find strong flashing light alerters to 
> place in the factory.
> 
> Such features must be remembered and available also in the 
> SIP era. In PSTN, the alerters were connected directly to the 
> phone network. Now, it is instead the SIP phone itself that 
> knows if it is called. Therefore it must be specified in the 
> SIP device spec.
> 
> Currently there are two kinds of electrical interfaces to 
> alerting systems.
> 
> Both are simple two wire interfaces.
> 
> One is resistance oriented. It has a high resistance ( 1 
> Mohm) until the alert is wanted. Then the resistance is low ( 
> below 50 ohm ). It can sustain a voltage of at least 50 V in 
> the inactivated state, and a current of 200 mA in the activated state.
> 
> The other is voltage oriented. A voltage over the interface 
> triggers the alerting. 12 V direct or alternating is common.
> 
> Since both usually are available on alerting systems, I 
> suggest that it can be sufficient to provide the resistance 
> oriented one on SIP phones.
> 
> I would also suggest an extension with a Bluetooth interface. 
> Using the serial port profile, and giving an AT command 
> response "RING" as the basic standard. It might be suitable 
> to have extensions from this basic version into variants 
> where you can specify some characteristics of the alert.
> 
> So, my proposal is to change from: 
> .....................................Current
> writing..........................................
> 4.9 Ringer Behavior
> 
>    The manner in which a user is alerted to an incoming call 
> (visually,
>    audibly or possibly both) MAY be used by the device. This includes
>    the different volumes and MAY point to a file that contains the
>    melody for the ringer alert.
> 
>    Ringer sound files MAY be specified for the following types of
>    incoming calls normal, high priority, internal and external.
> 
>    Different ringer sound files MAY also be associated with different
>    lines.
> 
>    The location of a call MAY also be indicated. This allows using the
>    phone by hearing-impaired or in noisy environments where external
>    speakers are used to render the sound. The location of the call is
>    also useful for paging by speakerphones. 
> :::::::::::::::::::End of current
> writing:::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 
> To:
> ::::::::::::::::::New
> proposal:::::::::::::::::::::::::::::::::::::::::::::::
> 4.9 Ringer Behavior
> 
>    The manner in which a user is alerted to an incoming call 
> (visually,
>    audibly or possibly both) MAY be configured in the device. 
> This includes
>    different volumes and the configuration MAY point to a 
> file that contains a
>    melody for the ringer alert.
> 
>    Ringer sound files MAY be specified for the following types of
>    incoming calls: normal, high priority, internal and external.
> 
>    Different ringer sound files MAY also be associated with different
>    lines.
> 
>    The location of a call MAY also be indicated. This allows using the
>    phone by hearing-impaired or in noisy environments where external
>    speakers are used to render the sound. The location of the call is
>    also useful for paging by speakerphones.
> 
>    SIP Telephony devices MUST provide an external interface to
>    an external alerting system. This allows free positioning 
> and selection of an alerting
>    system that may be visual, audible or tactile or any 
> combination of these modes.
>    An external interface MAY be a two-pole electrical 
> interface offering
>    low resistance (<50 ohm) during ring signals, and high 
> resistance ( > 1 Mohm ) between
>    ring indications.
>    It MAY also be a Bluetooth inteface with the serial 
> profile sending the "RING"
>    message at each ring signal. 
> -------------------------------------End of modified
> proposal------------------------------
> 
> 
> Agree?
> 
> 
> Gunnar Hellstrom
> -------------------------------------------
> Gunnar Hellstrom, Omnitor, Renathvagen 2
> SE 121 37 Johanneshov, SWEDEN
> Tel: [phone]  Mob: [phone]
> e-mail: [e-mail]
> web: www.omnitor.se
> 
> 
> 
> 
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