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

[Rich Adamson]

> 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.