Cisco SPA941 IP Phone Firmware 5.1.8

Fixes:

- SPA should escape occurrences of '#' in the dial string with 23 percent in outbound INVITE
- SDP in INVITE response, includes annexb=yes/no if present in INVITE message
- Fixed HTTPS with client authentication out-of-memory condition.
- bug fix: network ring back distortion
- bug fix: Phone does not allow dialing '#' key in the phone number
- If keep alive msg is not a valid $SIP-METHOD macro and keep alive destination is $PROXY, and REGISTER is enabled, the keep alive message should be sent to the last Register destination. But this does not work.
- Fixed this bug: If phone receives a NOTIFY with an unknown event, it might reboot
- Fixed: Phone will not play network ringback even if early media is negotiated to G711
- Fixed this problem: Phone does not use the same Authorization header fields in the ACK as in the corresponding INVITE, per RFC 3261

New Features:

- Disable 2 --> 4 line license upgrade feature. Make 4 extensions phone as default
- On incoming page, do not automatically put the current calls on hold. Instead mix the incoming audio with that of the currently active calls
- improve speakerphone
- Phone will reply 200 OK to a NOTIFY/ping event inside a dialog
- Added Broadsoft shared call appearance bridging support