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6 SIP
Support
SIP is a standardized Internet protocol for live person-to-person communication over the Internet.
VoIP or IP Telephony is just one application where SIP is used. Other applications, such as SIP based
high quality voice, video, presence, instant messaging and more is expected to be the next large
usage of the Internet after email and web surfing!
VoIP or IP Telephony is just one application where SIP is used. Other applications, such as SIP based
high quality voice, video, presence, instant messaging and more is expected to be the next large
usage of the Internet after email and web surfing!
However, SIP (and other similar protocols) does not traverse firewalls and NAT routers, unless the SIP
protocol is specifically supported.
protocol is specifically supported.
Your ADSL Internet Gate unit has full support for SIP!
6.1
SIP Communication to and from Your LAN
To allow SIP communication to and from clients on the LAN, the ADSL Internet Gate contains a full
SIP proxy and SIP registrar that dynamically control the NAT and firewall in the ADSL Internet Gate.
Thus, SIP clients on the LAN can communicate with other SIP clients over the Internet.
SIP proxy and SIP registrar that dynamically control the NAT and firewall in the ADSL Internet Gate.
Thus, SIP clients on the LAN can communicate with other SIP clients over the Internet.
With other NAT routers and firewalls, SIP communication may not be possible, or has to rely on
unreliable and insecure methods like STUN to try to keep doors open in your firewall. Some of these
methods for NAT/Firewall traversal also locks to only use SIP with a certain service provider. They do
not allow you to use the SIP protocol generally.
unreliable and insecure methods like STUN to try to keep doors open in your firewall. Some of these
methods for NAT/Firewall traversal also locks to only use SIP with a certain service provider. They do
not allow you to use the SIP protocol generally.
The SIP support in the ADSL Internet Gate allows for global and secure SIP communication and
requires no configuration – it just works! SIP Clients on the LAN just follow the SIP standard. Make
sure that STUN and other NAT traversal methods are turned off in the SIP clients you use!
requires no configuration – it just works! SIP Clients on the LAN just follow the SIP standard. Make
sure that STUN and other NAT traversal methods are turned off in the SIP clients you use!
For additional help please click on the question mark
visible on each configuration web page. If the
appearing help text is not sufficient then the “Read more” online links below it might explain further.
6.2
SIP Client Configuration
No special configuration of the ADSL Internet Gate is required for SIP clients on the LAN. In the SIP
Client, make sure STUN and other NAT-traversal functions are turned off.
Client, make sure STUN and other NAT-traversal functions are turned off.
Just configure the clients as if they were located on a global IP address and disregard that they are
behind the NAT/firewall in the ADSL Internet Gate. If there is any “outbound proxy” setting available in
the client’s configuration you may set it to the local IP address of this unit (by default 192.168.0.1),
though it is not necessary. SIP clients can register to any SIP servers on the Internet. (Registering to
more than 5 accounts requires purchase of additional licenses.)
behind the NAT/firewall in the ADSL Internet Gate. If there is any “outbound proxy” setting available in
the client’s configuration you may set it to the local IP address of this unit (by default 192.168.0.1),
though it is not necessary. SIP clients can register to any SIP servers on the Internet. (Registering to
more than 5 accounts requires purchase of additional licenses.)
You find guidelines how to configure various SIP clients and SIP phones by clicking “Using SIP:
Telephony, Video, Messaging” on the login page of the web interface.
Telephony, Video, Messaging” on the login page of the web interface.
6.3
Using the Built-in SIP Server
Your ADSL Internet Gate can also act as a complete standalone SIP server. You can register both
local (LAN) and remote (WAN) SIP clients to your own unit, enabling global SIP communication
without using an external SIP server. Note that you can use the internal SIP Server at the same time
as being SIP transparent and using a VoIP provider’s SIP services!
local (LAN) and remote (WAN) SIP clients to your own unit, enabling global SIP communication
without using an external SIP server. Note that you can use the internal SIP Server at the same time
as being SIP transparent and using a VoIP provider’s SIP services!
You configure your unit to act as a SIP server for your domain on the SIP Switch page, reachable
from the main menu of the web interface.
from the main menu of the web interface.
Enable Use as SIP server for domain(s) and enter the name of your domain! Then click Save.
You need to own the domain name you wish to use and the domain name needs to be translated to
the IP address of your unit by DNS.
the IP address of your unit by DNS.
Having done this, you can use SIP addresses like john.brown@example.usesip.com for your SIP
clients and communicate with everyone else in the open SIP world!
clients and communicate with everyone else in the open SIP world!