[SIPForum-techwg] Does the PBX know it is an emergency call

[Sanjay Sinha (sanjsinh)]

>Section 13 is clear that a SIP-PBX MUST disable transfer for 
>emergency calls, but this assumes a SIP-PBX can recognise an 
>emergency call.

Why should these features be disabled from the PBX? 

I am thinking of a use case where a generic contact center agent answers
the initial call and depending on nature of emergency may want to
transfer (or conference in) an expert who can handle the case better
than the generic agent.

Sanjay

> We should either clarify the words by saying 
>"for calls the SIP-PBX recognises as emergency calls" or by 
>mandating that the SIP-PBX recognise emergency calls. If we 
>choose the latter we would need to specify more precisely what 
>we mean, e.g., recognising service URN and recognising the 
>local dial string in the country concerned. The latter is 
>quite complex, because if the call comes from a SIP device you 
>could be faced with:
>- Tel:112;phone-context=xxx
>- Tel:112
>- SIP:112 at enterprise.com
>- SIP:112 at SP.com
>- SIP:112 at enterprise.com;user=dialstring
>- SIP:112 at SP.com;user=dialstring
>and perhaps others (e.g., with user=phone).
>
>John 
>
>> -----Original Message-----
>> From: Cullen Jennings [mailto:fluffy at cisco.com]
>> Sent: 17 February 2009 20:52
>> To: Elwell, John
>> Cc: SIPForum-TechWG
>> Subject: Re: [SIPForum-techwg] Does the PBX know it is an emergency 
>> call
>> 
>> 
>> Ok, so I'm lost, does the PBX need to do things like "no 
>transfer" or 
>> not. Right now the spec seems to imply yes in some place and no in 
>> others.
>> 
>> On Feb 13, 2009, at 4:51 , Elwell, John wrote:
>> 
>> > I suspect that a PBX would need to behave in many respects like a 
>> > phone in ecrit-phonebcp. That does indeed cater for a phone not 
>> > recognising an emergency call (only SHOULD strength), and hence 
>> > being unable to enforce things like no transfer. (This does not 
>> > preclude there being other aspects of phonebcp that are not 
>> > applicable to PBXs).
>> >
>> > John
>> >
>> >> -----Original Message-----
>> >> From: techwg-bounces at sipforum.org
>> >> [mailto:techwg-bounces at sipforum.org] On Behalf Of Cullen Jennings
>> >> Sent: 12 February 2009 08:35
>> >> To: SIPForum-TechWG
>> >> Subject: [SIPForum-techwg] Does the PBX know it is an 
>> emergency call
>> >>
>> >>
>> >> We say it is options for the pbx to use an SOS URN - I assume
>> >> this is
>> >> because of the difficulty of provisioning emergency dial
>> >> strings. But
>> >> if we go with this, the PBX will also not be able to thing 
>> like have
>> >> it MUST disable features like transfer. I suspect this is
>> >> going to get
>> >> more complicated by the time we straighten it out.
>> >>
>> >>
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>> 
>> 
>
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