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MultiVOIP FXS User Guide Phone Book Configuration
89
Outbound Phone Book Add Entry screen: Field Definitions (cont’d)
Field Name Values Description
SIP Fields
Use Proxy Y/N Select if proxy server is used.
Transport
Protocol
TCP or
UDP
Voip administrator must choose between UDP and TCP transmission protocols. UDP is a
high-speed, low-overhead connectionless protocol where data is transmitted without
acknowledgment, guaranteed delivery, or guaranteed packet sequence integrity. TCP is
slower connection-oriented protocol with greater overhead, but having acknowledgment
and guarantees delivery and packet sequence integrity.
SIP Port
Number
5060 or other
*See RFC 3087
(“Control of
Service
Context using
SIP Request-
URI,” by the
Network
Working
Group).
The SIP Port Number is a UDP logical port number. The voip will “listen” for
SIP messages at this logical port. If SIP is used, 5060 is the default, standard, or
“well known” port number to be used. If 5060 is not used, then the port number
used is that specified in the SIP Request URI (Universal Resource Identifier).
SIP URL sip.userphone
@
hostserver,
where
“userphone”
is the
telephone
number and
“hostserver”is
the domain
name or an
address on the
network
Looking similar to an email address, a SIP URL identifies a user's address.
In SIP communications, each caller or callee is identified by a SIP url:
sip:user_name@host_name. The format of a sip url is very similar to an email
address, except that the “sip:“ prefix is used.