[Asterisk-Users] NAT and SIP

[Tais M. Hansen]

Hi,

Does Asterisk have a limit to how many NAT'ed SIP clients it supports behind a 
single IP?

I have the weirdest problem ever. I have three SIP endpoints. SNOM phones, if 
it matters. Their extensions are 200, 201 and 202. Apart from the 
username/password, the sip entries in sip.conf all have identical 
configuration. They're all NAT'ed behind the same IP. 200 and 202 registers 
just fine, but 201 is completely ignored by Asterisk. I've traced the 
REGISTER packets from the phones and compared 202 to 201. They're pretty much 
identical, apart from tags, CSEQ and stuff like that. 202 gets a 100 Trying 
reply, but 201 doesn't get anything. There's nothing going on in Asterisk 
console debug output.

I then moved the 201 phone to a different LAN, so it got NAT'ed behind a 
different IP. There are other phones on that LAN which registers fine. Still 
no response from Asterisk though. Then I moved it to a third network, still 
NAT'ed, but without any other SIP clients. There it registered just fine. I 
then disconnected it, let it time out in Asterisk and connected it to the 
first LAN again. No reply.

So this leads me to believe there's some kind of limit per IP on NAT'ed SIP 
clients.

Can anybody shed some light on this?


[200]
type        = friend
username    = 200
secret      = 200secrets
host        = dynamic
amaflags    = default
accountcode = myrealm
context     = incoming
realm       = myrealm
dtmfmode    = rfc2833
language    = da
nat         = yes
callgroup   = 20
pickupgroup = 20
callerid    = "SNOM" <200>
qualify     = 3000

[201]
type        = friend
username    = 201
secret      = 201secrets
host        = dynamic
amaflags    = default
accountcode = myrealm
context     = incoming
realm       = myrealm
dtmfmode    = rfc2833
language    = da
nat         = yes
callgroup   = 20
pickupgroup = 20
callerid    = "SNOM" <201>
qualify     = 3000

[202]
type        = friend
username    = 202
secret      = 202secrets
host        = dynamic
amaflags    = default
accountcode = myrealm
context     = incoming
realm       = myrealm
dtmfmode    = rfc2833
language    = da
nat         = yes
callgroup   = 20
pickupgroup = 20
callerid    = "SNOM" <202>
qualify     = 3000

-- 
Regards,
Tais M. Hansen
ComX Networks A/S
Tel: +45-70257474
Fax: +45-70257374

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