[Asterisk-Users] Re: busy line status on CISCO 7940/7960

[Sergio]

>>Cisco TAC service told me that they will not support RFC 2848/3265 for 
>>the 7960 phones
>>So no busy status line notification with subscribe/notify system. This 
>>is really a bad news for me.
>>So they are not planning to backport sip firmware new features to the 
>>old phones.
>>    
>>
>
>Since the 7960 design is very old, its likely due to internal limitations
>such as available memory, etc. Not surprising at all.
>  
>
Telnetting the phone I see a good amount of free memory space. 
subscribe/nority is just a firmware implementation.
I think it's just a market choice. They wanna sell their new phones with 
that feature on.