Hopefully such behavior, if present at all, will be configurable. I feel 
perfectly capable of hanging up the phone when I become tired of waiting 
for the call to be answered, and in fact I will generally have to take 
much the same action even if my phone terminates the call on its own, so 
there is really no benefit to it doing so. So, *I* would prefer not to 
have my phones unilaterally terminate a call attempt. YMMV.

        Paul

Brett Tate wrote:
>>    From: "Brett Tate" <[EMAIL PROTECTED]>
>>
>>    Be aware that some customer service and reservation 
>> systems send 18x
>>    responses while queued waiting to be answered by person.  
>> It might take
>>    longer than 180 seconds for the call to be answered by 
>> person.  Thus
>>    your users might complain about poor interoperability 
>> (dropped calls)
>>    concerning calls to such numbers.
>>
>> Or we might interpret it this way:  I don't want to do 
>> business with companies that take over 180 seconds (three 
>> minutes!) to answer their phones, and provisioning my SIP 
>> phone this way enforces that rule.
> 
> Sounds good to me; however the extra minute is sometimes worth reaching
> the called party. :)
> 
>>From a caller perspective (on some phones), it might not always be clear
> that the call has not yet been answered.  If the timer expires while
> caller is hearing recordings indicating that their call will be answered
> in approximately 5 minutes, the user might not immediately recognize
> that they potentially should locally adjust such a timeout value prior
> to calling the same number again.
> 
> 
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