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Setting Up the Polycom VVX 1500 C Phone
3 - 9
For more information, refer to “Technical Bulletin 5844: SIP Server Fallback
Enhancements on Polycom VVX 1500 C Phones” at
http://www.polycom.com/support/voice/soundpoint_ip/VoIP_Technical
_Bulletins_pub.html .
Configuration changes can be performed centrally at the provisioning server.
For information on configuration file settings, refer to DNS Cache <dns/> on
page A-4 and Registration <reg/> on page A-5.
Voice Mail Integration
The phone is compatible with voice mail servers. The subscribe contact and
callback mode can be configured per user/registration on the phone. Voice
mail access can be configured to be through a single key press. A
message-waiting signal from a voice mail server triggers the message-waiting
indicator to flash and the call waiting audio tone is played through the active
audio path.
Configuration changes can be performed centrally at the provisioning server
or locally. For detailed information on configuration file settings, refer to
Messaging <msg/> on page A-6.
Shared Call Appearances
Calls and lines on multiple phones can be logically related to each other. A call
that is active on one phone will be presented visually to phones that share that
call appearance. Mutual exclusion features emulate traditional PBX or key
system privacy for shared calls. Incoming calls can be presented to multiple
phones simultaneously. Users at the different locations have the ability to
interrupt remote active calls.
This feature is dependent on support from a SIP server that binds the
appearances together logically and looks after the necessary state notifications
and performs an access control function.
Note
Your SIP server provider should be consulted for recommended methods of
configuring phones and servers for fail-over configuration. Static DNS cache should
only be used when you cannot install the correct entries into the DNS server.
The use of the static DNS cache is required when connecting into a Cisco Unified
Communications Manager system. This is because Cisco Unified Communications
Manager does not support simultaneous registrations from a single device to
multiple subscribers in the Cisco Unified Communications Manager cluster. The
recommended DNS cache configuration would list two subscriber IP addresses,
then an SRST reference (if one is present). This causes the Polycom VVX 1500 C
phone to attempt registration to a single subscriber based on the order of the IP
Addresses listed in the DNS cache. If the first subscriber in the list is down, the
Polycom VVX 1500 C will try the second subscriber, and then third. If a subscriber
comes back online, the Polycom VVX 1500 C will attempt to re-register to that
subscriber.