Capturing Voice And Fax Packets - Fortinet fortivoice Administrator's Manual

DHCP IP Range
DHCP Excluded IP
Range
Reserved IP Address
3. Click Create.

Capturing voice and fax packets

When troubleshooting networks, it helps to look inside the contents of the packets. This helps
to determine if the packets, route, and destination are all what you expect. Traffic capture can
also be called packet sniffing, a network tap, or logic analyzing.
Packet sniffing tells you what is happening on the network at a low level. This can be very useful
for troubleshooting problems, such as:
• finding missing traffic
• seeing if sessions are setting up properly
• locating ARP problems such as broadcast storm sources and causes
• confirming which address a computer is using on the network if they have multiple
addresses or are on multiple networks
• confirming routing is working as you expect
• intermittent missing PING packets.
If you are running a constant traffic application such as ping, packet sniffing can tell you if the
traffic is reaching the destination, how the port enters and exits the FortiVoice unit, if the ARP
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TFTP server (Opt66) The default TFTP server (192.168.2.99) is where the
configuration files for the supported phones are stored. This is
also the IP address of the default gateway that the DHCP server
assigns to the DHCP clients. If you have your own TFTP server
for such information, enter its IP address in this field. However,
SIP phone auto-provisioning will not work in this case. For more
information, see
page
Lease time Enter the length of time an IP address remains assigned to a
(Seconds) client. Once the lease expires, the address is released for
allocation to the next client request for an IP address. The
default time is 604800 seconds.
Vender Class Select this option to apply the DHCP configuration to the
Identifier option phones of a specific vendor identified by the VCI string supplied
by the vendor or by checking Monitor > PBX Status > DHCP >
VCI.
VCI string Enter the phone VCI string supplied by the vendor.
Click New to enter the start and end for the range of IP
addresses that this DHCP server assigns to the DHCP clients.
Click New to enter a range of IP addresses that this server
should not assign to the DHCP clients.
Click New to enter an IP address from the DHCP server to
match it to a specific client using its MAC address.
In a typical situation, an IP address is assigned ad hoc to a
client, and that assignment times out after a specific time of
inactivity from the client, known as the lease time. To ensure a
client always has the same IP address, that is, there is no lease
time, use this option.
"Configuring SIP phone auto-provisioning" on
108.
Page 48 FortiVoice Enterprise Phone System 4.0.0 Administration Guide