Configuring The Network Parameters - Novell LINUX ENTERPRISE DESKTOP 10 SP1 - GNOME 23-05-2007 Manual

Table of Contents

Linphone uses the session initiation protocol (SIP) to establish a connection with a remote host. In

SIP, each party is identified by a SIP URL:

sip:username@hostname

username is your login on your Linux machine and hostname the name of the computer you are

using. If you use a SIP provider, the URL would look like the following example:

sip:username@sipserver

username is the username chosen when registering at a SIP server. sipserver is the address of the SIP

server or your SIP provider. For details on the registration procedure, refer to

"Configuring the SIP

Options" on page 162

and check the provider's registration documentation. For a list of providers

suitable for your purpose, check the Web pages mentioned in

"For More Information" on page

167.

The URL to use is determined by the type of connection you choose. If you chose to call another

party directly without any further routing by a SIP provider, you would enter a URL of the first type.

If you chose to call another party via a SIP server, you would enter a URL of the second type.

Calling in the Same Network

If you intend to call a friend or coworker belonging to the same network, you just need the correct

username and hostname to create a valid SIP URL. The same applies if this person wants to call you.

As long as there is no firewall between you and the other party, no further configuration is required.

Calling across Networks or the Internet (Static IP Setup)

If you are connected to the Internet using a static IP address, anyone who wants to call you just

needs your username and the hostname or IP address of your workstation to create a valid SIP URL,

as described in

"Calling in the Same Network" on page

161. If you or the calling party are located

behind a firewall that filters incoming and outgoing traffic, open the SIP port (5060) and the RTP

port (7078) on the firewall machine to enable Linphone traffic across the firewall.

Calling across Networks or the Internet (Dynamic IP Setup)

If your IP setup is not static—if you dynamically get a new IP address every time you connect to the

Internet—it is impossible for any caller to create a valid SIP URL based on your username and an IP

address. In these cases, either use the services offered by a SIP provider or use a DynDNS setup to

make sure that an external caller gets connected to the right host machine. More information about

DynDNS can be found at

http://en.wikipedia.org/wiki/Dynamic_DNS (http://en.wikipedia.org/wiki/

Dynamic_DNS).

Calling across Networks and Firewalls

Machines hidden behind a firewall do not reveal their IP address over the Internet. Thus, they cannot

be reached directly from anyone trying to call a user working at such a machine. Linphone supports

calling across network borders and firewalls by using a SIP proxy or relaying the calls to a SIP

provider. Refer to

"Configuring the SIP Options" on page 162

for a detailed description of the

necessary adjustments for using an external SIP server.