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Setting Up the Polycom VVX 1500 D Phone
2 - 7
The following information should be noted:
• If the phone has only the H.323 protocol enabled, it cannot be used to
answer SIP calls.
• If the phone has only the SIP protocol enabled, it cannot be used to answer
H.323 calls.
• If both SIP and H.323 protocols are disabled by mistake, the phone will
continue to work as a SIP-only phone; however, the phone is not
registered (you are able to send and receive SIP URL calls).
• The protocol that is used to place a call is stored in the placed call list of the
user’s phone.
• The protocol to be used when placing a call from the user’s local contact
directory is unspecified by default. The user can select SIP or H.323.
• The protocol that is used when placing a call from the user’s corporate
directory depends on the order of the attributes in the corporate directory.
If only SIP_address is defined, then the SIP protocol is used. If only
H323_address is defined, then the H.323 protocol is used. If both are
defined, then the one that is defined first is used. For example, if
dir.corp.attribute.4.type
is SIP_address and
dir.corp.attribute.5.type
is H323_address, then the SIP protocol is
used.
• By default, the user is presented with protocol routing choices when a call
could be placed with more than one protocol from its current context. The
user must choose between SIP and H.323 to place a call by pressing the
appropriate soft key.
• Calls made using H.323 cannot be forwarded or transferred.
— The Transfer and Forward soft keys are not displayed during an
H.323 call on a Polycom VVX 1500 D phone. The Forward soft key is
not displayed on the idle display of a Polycom VVX 1500 D phone if
the primary line is an H.323 line.
— If a Polycom VVX 1500 D user presses the Transfer soft key during an
H.323 call on a Polycom VVX 1500 D phone, no action is taken.
— The auto-divert field in the local contact directory entry is ignored
when a call is placed to that contact using H.323.
— If a conference host ends a three-way conference the call and one of the
party is connected by H.323, that party is not transferred to the other
party.