User's Manual

• The proxy must be able to transmit mixed MIME-types (for successful
transferring of the location information).
5. Configuring the proxy with emergency user name and password.
• You must have configuration access to the proxy to arrange for an emergency
user (if this manner of implementation is chosen).
• The emergency user and password at the proxy side must be identical to the
emergency user and password that every IP Deskphone is configured with.
Otherwise, you cannot make an emergency call without logging on.
Characteristics of emergency calls
During an active emergency call, the user:
• cannot make outgoing calls.
• is not notified of incoming calls and cannot accept incoming calls. Incoming calls receive
a call waiting tone.
• cannot transfer, join, or conference the emergency call, place the emergency call on hold,
or park the emergency call.
• cannot auto-retrieve a parked call and auto-retrieval of parked calls is not displayed.
• cannot disconnect the emergency call. Only an emergency center or operator can
disconnect the emergency call. If the user attempts to disconnect after the call has been
made, the IP Deskphone switches to loudspeaker. If the loudspeaker mode is already on,
the connection remains.
• cannot change Audio Quality.
• can reply to IM pop-ups, which are operational during an emergency call.
During an emergency call, the keys function as follows:
• the Services, Inbox, Outbox, Address Book, Mute , and Hold keys are all disabled.
• a right click of the mouse does not show the services menu.
• the increase and decrease volume keys remain functional.
• the feature keys are visible and all except the speed-dial keys are functional.
NAT firewall traversal
The objective of putting devices behind a Network Address Translator (NAT) is to protect the
devices from external interruption and to extend the public IP address space. However, the
shield to stop unsolicited incoming traffic also has the drawback of breaking a number of IP
applications, including SIP.
NAT firewall traversal
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