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Diffstat (limited to 'configs/sip.conf.sample')
| -rw-r--r-- | configs/sip.conf.sample | 121 |
1 files changed, 86 insertions, 35 deletions
diff --git a/configs/sip.conf.sample b/configs/sip.conf.sample index 6954843ae..842c7b513 100644 --- a/configs/sip.conf.sample +++ b/configs/sip.conf.sample @@ -293,41 +293,92 @@ srvlookup=yes ; Enable DNS SRV lookups on outbound calls ; Default is 0 tries, continue forever ;----------------------------------------- NAT SUPPORT ------------------------ -; The externip, externhost and localnet settings are used if you use Asterisk -; behind a NAT device to communicate with services on the outside. - -;externip = 200.201.202.203 ; Address that we're going to put in outbound SIP - ; messages if we're behind a NAT - - ; The externip and localnet is used - ; when registering and communicating with other proxies - ; that we're registered with -;externhost=foo.dyndns.net ; Alternatively you can specify an - ; external host, and Asterisk will - ; perform DNS queries periodically. Not - ; recommended for production - ; environments! Use externip instead -;externrefresh=10 ; How often to refresh externhost if - ; used - ; You may add multiple local networks. A reasonable - ; set of defaults are: -;localnet=192.168.0.0/255.255.0.0; All RFC 1918 addresses are local networks -;localnet=10.0.0.0/255.0.0.0 ; Also RFC1918 -;localnet=172.16.0.0/12 ; Another RFC1918 with CIDR notation -;localnet=169.254.0.0/255.255.0.0 ;Zero conf local network - -; The nat= setting is used when Asterisk is on a public IP, communicating with -; devices hidden behind a NAT device (broadband router). If you have one-way -; audio problems, you usually have problems with your NAT configuration or your -; firewall's support of SIP+RTP ports. You configure Asterisk choice of RTP -; ports for incoming audio in rtp.conf -; -;nat=no ; Global NAT settings (Affects all peers and users) - ; yes = Always ignore info and assume NAT - ; no = Use NAT mode only according to RFC3581 (;rport) - ; never = Never attempt NAT mode or RFC3581 support - ; route = Assume NAT, don't send rport - ; (work around more UNIDEN bugs) +; +; WARNING: SIP operation behind a NAT is tricky and you really need +; to read and understand well the following section. +; +; When Asterisk is behind a NAT device, the "local" address (and port) that +; a socket is bound to has different values when seen from the inside or +; from the outside of the NATted network. Unfortunately this address must +; be communicated to the outside (e.g. in SIP and SDP messages), and in +; order to determine the correct value Asterisk needs to know: +; +; + whether it is talking to someone "inside" or "outside" of the NATted network. +; This is configured by assigning the "localnet" parameter with a list +; of network addresses that are considered "inside" of the NATted network. +; IF LOCALNET IS NOT SET, THE EXTERNAL ADDRESS WILL NOT BE SET CORRECTLY. +; Multiple entries are allowed, e.g. a reasonable set is the following: +; +; localnet=192.168.0.0/255.255.0.0 ; RFC 1918 addresses +; localnet=10.0.0.0/255.0.0.0 ; Also RFC1918 +; localnet=172.16.0.0/12 ; Another RFC1918 with CIDR notation +; localnet=169.254.0.0/255.255.0.0 ; Zero conf local network +; +; + the "externally visible" address and port number to be used when talking +; to a host outside the NAT. This information is derived by one of the +; following (mutually exclusive) config file parameters: +; +; a. "externip = hostname[:port]" specifies a static address[:port] to +; be used in SIP and SDP messages. +; The hostname is looked up only once, when [re]loading sip.conf . +; If a port number is not present, use the "bindport" value (which is +; not guaranteed to work correctly, because a NAT box might remap the +; port number as well as the address). +; This approach can be useful if you have a NAT device where you can +; configure the mapping statically. Examples: +; +; externip = 12.34.56.78 ; use this address. +; externip = 12.34.56.78:9900 ; use this address and port. +; externip = mynat.my.org:12600 ; Public address of my nat box. +; +; b. "externhost = hostname[:port]" is similar to "externip" except +; that the hostname is looked up every "externrefresh" seconds +; (default 10s). This can be useful when your NAT device lets you choose +; the port mapping, but the IP address is dynamic. +; Beware, you might suffer from service disruption when the name server +; resolution fails. Examples: +; +; externhost=foo.dyndns.net ; refreshed periodically +; externrefresh=180 ; change the refresh interval +; +; c. "stunaddr = stun.server[:port]" queries the STUN server specified +; as an argument to obtain the external address/port. +; Queries are also sent periodically every "externrefresh" seconds +; (as a side effect, sending the query also acts as a keepalive for +; the state entry on the nat box): +; +; stunaddr = foo.stun.com:3478 +; externrefresh = 15 +; +; Note that at the moment all these mechanism work only for the SIP socket. +; The IP address discovered with externip/externhost/STUN is reused for +; media sessions as well, but the port numbers are not remapped so you +; may still experience problems. +; +; NOTE 1: in some cases, NAT boxes will use different port numbers in +; the internal<->external mapping. In these cases, the "externip" and +; "externhost" might not help you configure addresses properly, and you +; really need to use STUN. +; +; NOTE 2: when using "externip" or "externhost", the address part is +; also used as the external address for media sessions. +; If you use "stunaddr", STUN queries will be sent to the same server +; also from media sockets, and this should permit a correct mapping of +; the port numbers as well. +; +; In addition to the above, Asterisk has an additional "nat" parameter to +; address NAT-related issues in incoming SIP or media sessions. +; In particular, depending on the 'nat= ' settings described below, Asterisk +; may override the address/port information specified in the SIP/SDP messages, +; and use the information (sender address) supplied by the network stack instead. +; However, this is only useful if the external traffic can reach us. +; The following settings are allowed (both globally and in individual sections): +; +; nat = no ; default. Use NAT mode only according to RFC3581 (;rport) +; nat = yes ; Always ignore info and assume NAT +; nat = never ; Never attempt NAT mode or RFC3581 support +; nat = route ; route = Assume NAT, don't send rport +; ; (work around more UNIDEN bugs) ;----------------------------------- MEDIA HANDLING -------------------------------- ; By default, Asterisk tries to re-invite the audio to an optimal path. If there's |