Challenge Sip Initial Invite Messages - Cisco 8831 Administration Manual

Set Security Features
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To set the connection type, navigate to Admin Login > advanced > Voice > System. Under Internet
Connection Type choose the Connection Type:
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DHCP Option Support
The table shows the DHCP options that are supported on the conference phones:
Network Standard
DHCP option 1
DHCP option 2
DHCP option 3
DHCP option 6
DHCP option 15
DHCP option 41
DHCP option 42
DHCP option 43
DHCP option 60
DHCP option 66
DHCP option 125
DHCP option 150
DHCP option 158
DHCP option 159
DHCP option 160

Challenge SIP Initial INVITE Messages

The SIP INVITE (initial) message in a session can be challenged by the endpoint. The challenge restricts
the SIP servers that are permitted to interact with the devices on a service provider network. This
significantly increases the security of the VoIP network by preventing malicious attacks against the
device.
Cisco Unified IP Conference Phone 8831 for Third-Party Call Control Administration Guide
4-2
DHCP Timeout on Renewal parameter causes the device to request a renewal of its IP address. If the
DHCP server returns the IP address that it originally assigned to the phone, the DHCP assignment
is presumed to be operating correctly. Otherwise, the phone resets to try to fix the issue.
Static IP—A static IP address for the phone.
Dynamic Host Configuration Protocol (DHCP)
Static IP, and configure the following:
– Static IP Address of the phone.
– Netmask of the phone.
– Gateway IP address
Subnet mask
Time Offset
Router
Domain name server
Domain name
IP address lease time
NTP Server
Vendor Specific Information
Vendor class identifier
TFTP server name
Vendor-Identifying Vendor-Specific Information
TFTP server
Chapter 4 Configure Security, Quality, and Network Features