Sip Settings - Bizfon 4000 Administrator's Manual

Bizfon Manual II: Administrator's Guide
If Si is the RTP timestamp from packet i, and Ri is the time of arrival in RTP timestamp units for packet i, then variance for packet i may be
expressed as following: V(i) = |(Ri - R1) - (Si - S1)| = |(Ri - Si) - (R1 - S1)|
Rx Maximum Delay = max V(i) / 8
Please Note: RTP Statistics is logged only when at least one of the call endpoints is located on the Bizfon, e.g. it will not be logged when:
•
calls incoming from or addressed to the IP lines or remote extension,
•
calls from an external user are routed to another external user through Bizfon's routing rules.
In the first case, RTP statistics will be logged if remote extension or IP line user is calling locally to the Bizfon's extension or auto attendant.

SIP Settings

The SIP Settings provide information on the SIP receive UDP and TCP ports and allows to select DNS server configuration for SIP and SIP timers
scheme.
UDP Port indicates the SIP UDP (User Datagram Protocol)
receive port number. By default 5060 is selected and used.
The SIP UDP port cannot be in the selected RTP/RTCP port
range for FXS and IP lines (see
"Mapped port for SIP shouldn't be in RTP port range" error
appears.
TCP Port indicates the SIP TCP (Transmission Control
Protocol) receive port number. By default 5060 is selected and
used.
Please Note: Bizfon will not use TCP protocol as a transport
for SIP messages if the TCP Port field is left empty.
Enable Session Timer enables advanced mechanisms for
connection activity checking. This option allows both user
agents and proxies to determine if the SIP session is still
active.
The DNS server for SIP radio button group allows to choose between regular DNS servers configured in the
servers for the SIP traffic.
•
Use default is used to apply regular DNS servers for the SIP traffic.
•
Specific is used to enable SIP specific DNS servers. For this selection, both primary and secondary SIP DNS servers should be defined in the
SIP DNS 1 and SIP DNS 2 text fields. At the least, a primary DNS server should be inserted.
The SIP Timers radio button group is used to define the timeouts of the SIP messages retransmission.
•
RFC 3261 will apply standard SIP timers described in the corresponding specification.
•
High availability will apply SIP timers to shorten the call establishment, registration confirmation and registration failure procedures. This
selection provides more firmness to the SIP connection but increases the network traffic on the Bizfon.
•
Custom allows defining manually the Registration Timeout, Registration Failure Timeout, Transaction Duration and Session refresh
timeout SIP timers (in seconds).
Bizfon4000 (SW Version 3.1.x)
RTP Settings), otherwise the
Administrator's Menus
Fig. II-83: SIP Settings page
DNS Settings page and specific DNS
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