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About Using a Proxy Server with SIP
About Using a Proxy Server with SIP
About NAT Support with SIP
Note
Cisco ATA 186 Installation and Configuration Guide
4-6
When using a Proxy Server, the Cisco ATA 186 sends a call to request a User ID
(telephone number). The proxy server holds a table of telephone numbers and
their equivalent IP addresses. You can enter this table manually (static), or the
Cisco ATA 186 can dynamically send the IP address to the proxy server when it
starts. This process is called Registration. To use this process, SIPRegOn must be
set to 1. The default is 0 or Off.
Registration has an expiration timeout, so the Cisco ATA 186 must periodically
resend its request. The interval is the number of seconds based on the value of
SIPRegInterval.
If OutboundProxy is enable all messages go through the IP address or URL listed.
The proxy routes to the end IP address.
The following three parameters allow the Cisco ATA 186 to be used behind a
firewall or a network address translation (NAT) device to access a SIP proxy
server or user agent outside the firewall to register and make or receive calls. A
firewall or NAT device has a WAN IP address which is reachable from outside
the firewall, and a LAN IP address which is reachable from inside the firewall.
SIP Port
This is the logical UDP port where the device is listening for SIP messages. The
standard port number is 5060.
Do not use reserved ports, such as 80 (HTTP).
To specify a port for the gatekeeper or proxy server, you can use either the IP
address or the URL. If no port is specified, the device uses the default of 5060.
If you want to specify a port with the IP address, use a dot (.):
123.10.10.10.5061
With a URL, use a colon (:):
www.company.com:5061
Chapter 4
Protocol-Specific Configurations
OL-1267-01
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Troubleshooting
