Device Support Details - 3Com 3C10402B Administrator's Manual

234 C 10: SIP-M
HAPTER
Device Support
Details
O
ODE PERATIONS
Virtual Tie Lines are not available on a system running in SIP mode.
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However, you can achieve the same result, connecting different
systems, by configuring each system that is running SIP mode as a
trusted SIP interface. A trusted SIP interface can include SIP proxies,
SIP applications, SIP gateways, and any other third-party SIP device,
including 3Com VCX IP Telephony systems. Telephone communication
between the NBX and VCX systems supports Make Call, Receive Call,
and Call Hold. Each NBX system can use the same IP Messaging
Module.
A Trusted SIP Interface connection between an NBX system and a
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3Com VCX telephone system can share the same IP Messaging
Module. However, the automatic mailbox creation process can work
for only one type of system. Typically, you use automatic mailbox
creation for the enterprise-class VCX system and manual mailbox
creation for the NBX system or systems.
Paging is supported on 3Com phones (except the 3Com 3108
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Wireless Telephone) with SIP enabled. Generic SIP phones and the
3108 Wireless Telephone can neither initiate nor receive pages.
There are restrictions on the Automatic Call Distribution (ACD) feature
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on a SIP mode system. See
Directory services are not supported on generic SIP phones and 3Com
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3108 Wireless Telephones.
SIP mode systems support Attendant Console operations. However,
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only call status, not line status, of SIP endpoints is available for SIP
telephones.
A TAPI application is only able to monitor generic SIP phones and the
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3Com 3108 Wireless telephone.
A SIP mode system supports E-911 functionality. However, for 911 calls,
you must manually configure generic SIP telephones and the 3Com 3108
Wireless Telephone to use the alternate SIP gateway address if the Call
Processor is not available. For generic SIP telephones, this behavior is
specific to the telephone, and it is the responsibility of telephone to
provide this functionality.
There are important distinctions to keep in mind when you consider how
devices connected to a SIP mode system behave:
SIP-only telephones such the 3Com 3108 Wireless Telephone and
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generic, third-party SIP telephones can use many of the standard
telephony features through feature codes.
"SIP Mode and ACD" on page 239.