I've just recently got this working with asterisk 0.7.1.
You also need to add values for:
Localnet localmask to indicate the values that do not get externip set.
However, this did not fully solve the problem for me. External phones would
register just fine, but then I kept getting lots of retry failures. It
appears that asterisk changes the Call-ID value between what is sent and
what is stored internally!
Once a phone registers I sip debug shows asterisk sending a NOTIFY message
wit a Call-ID value using the externip address, however the 200 OK response
back from the phone has a call id with the same random characters but has
the localip address instead.
I've currently solved this but removing the ip address from build_callid()
until I try to see where asterisk gets this wrong. Has anyone else seen
this?
Having made this fix I now have SIP going NAT - NAT - asterisk.
Kevin
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Patrick Lidstone (Personal E-mail)
Sent: 26 January 2004 18:31
To: [EMAIL PROTECTED]
Subject: [Asterisk-Users] SIP behind NAT - use of externip option
I am having difficulty configuring SIP behind NAT (using latest CVS).
Using sip.conf:
[general]
port=5060 ; Port to bind to
externip=ww.xx.yy.zz
bindaddr=0.0.0.0
nat=yes
register=[userid]:[EMAIL PROTECTED]/2000
[voiptalk.org]
nat=yes
externip=ww.xx.yy.zz
type=friend
secret=[password]
nat=yes
reinvite=no
canreinvite=no
I fail to register. SIP Debug gives:
SIP Debugging Enabled
Jan 26 18:20:04 NOTICE[9226]: chan_sip.c:3126
sip_reg_timeout: Registration for '[EMAIL PROTECTED]'
timed out, trying again 11 headers, 0 lines Reliably
Transmitting: REGISTER sip:voiptalk.org SIP/2.0
Via: SIP/2.0/UDP 192.168.0.89:5060;branch=z9hG4bK02c0373f
From: sip:[EMAIL PROTECTED];tag=as5548d275
To: sip:[EMAIL PROTECTED]
Call-ID: [EMAIL PROTECTED]
CSeq: 103 REGISTER
User-Agent: Asterisk PBX
Expires: 120
Contact: sip:[EMAIL PROTECTED]
Event: registration
Content-length: 0
(no NAT) to 82.145.32.73:5060
Retransmitting #1 (no NAT):
REGISTER sip:voiptalk.org SIP/2.0
Via: SIP/2.0/UDP 192.168.0.89:5060;branch=z9hG4bK02c0373f
From: sip:[EMAIL PROTECTED];tag=as5548d275
To: sip:[EMAIL PROTECTED]
Call-ID: [EMAIL PROTECTED]
CSeq: 103 REGISTER
User-Agent: Asterisk PBX
Expires: 120
Contact: sip:[EMAIL PROTECTED]
Event: registration
Content-length: 0
to 82.145.32.73:5060
Retransmitting #2 (no NAT):
... as previous frame ...
I would expect (perhaps wrongly?) that the externip would be
reflected in the Via: header (it seems to be when I look at
the traces from a SNOM 100 successfully registery with
voiptalk behind the same firewall). And the (no NAT) comments
in the debug trace also look suspicious, given the explicit
nat=yes in the config.
Any hints? I guess the externip might be in the wrong place
or conflicting with one of my other options, but neither the
docs don't seem to offer much by way of advice (I've checked
the wiki, googled etc). Thanks Patrick
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