3Com 3C10402B Administrator's Manual page 233

Generic SIP telephones
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3Com pcXset Soft Telephone Client
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Analog telephones
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However, you cannot use these devices to add extensions to a
conference.
ATA devices and the 3Com pcXset Soft Telephone Client cannot
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initiate a conference on a SIP mode system.
The Auto Discovery feature works for 3Com phones (except the 3108
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Wireless Telephone), and cards and devices. You must configure SIP
devices and gateways, and the 3Com 3108 Wireless Telephone
manually. Typically, you use NetSet utility to add the telephone user
and user extension to the system database. You specify the extension
and the IP, and authentication parameters that the SIP device uses to
communicate with the Call Processor on the SIP device itself.
NBX Messaging does not work on a system running in SIP mode. A SIP
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mode system must have an external messaging system to provide
voice mail and Auto Attendant services. 3Com recommends the
3Com IP Messaging Module. On a system running 3Com call control
mode, you need an optional license to run an external messaging
system. If you enable SIP mode on a system, no external messaging
license is required.
A telephone user can login at different phones (Hot Desking), but only
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one login at a time is allowed. If a telephone user is on a call, and then
logs into another phone, the system disconnects the first call. This
feature works only on generic SIP telephones and the 3Com 3108
Wireless Telephone. This feature is not available on a system that is
running 3Com call control mode.
For Emergency 911 calls, you can configure a 3Com telephone to use
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an alternate SIP gateway if one is available to connect calls if the
system is down. 3Com telephones do not support the DHCP option
for providing an alternate SIP gateway address, so this feature requires
manual configuration on the telephone.
Button mapping is not supported for the 3Com 3108 Wireless
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Telephone or generic SIP telephones. You cannot map a CO Line to a
generic SIP telephone or a 3108 Wireless Telephone.
The 3Com 3108 Wireless Telephone or generic SIP telephones cannot
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be bridged extensions.
Overview of SIP Mode on the NBX Platform 233