Asterisk: The Future of Telephony

SIP

Just as with IAX, the SIP configuration file (sip.conf) contains configuration information for SIP channels. The headings for the channel definitions are formed by a word framed in square brackets ([])—again, with the exception of the [general] section, where we define global SIP parameters. Don’t forget to use comments generously in your sip.conf file. Precede the comment text with a semicolon; everything to the right will be ignored.

General SIP Parameters

The following options are to be used within the [general] section of sip.conf:

allowguest

If set to no, this disallows guest SIP connections. The default is to allow guest connections. SIP normally requires authentication, but you can accept calls from users who do not support authentication (i.e., do not have a secret field defined). Certain SIP appliances (such as the Cisco Call Manager v4.1) do not support authentication, so they will not be able to connect if you set allowguest=no.

allowguest=no

bindaddr and bindport

These optional parameters allow you to control the IP interface and port on which you wish to accept SIP connections. If omitted, the port will be set to 5060, and all IP addresses in your Asterisk system will accept incoming SIP connections. If multiple bind addresses are configured, only those interfaces will listen for connections. The address 0.0.0.0 tells Asterisk to listen on all interfaces.

bindaddr=0.0.0.0
bindport=5060

callevents

Set this to yes when you want SIP to generate Manager events. This will be important ...