25 Aug
2006
25 Aug
'06
5:49 a.m.
Looks like there is an ALG (application layer gateway) between the SIP
client and the SIP proxy. Often these SIP ALGs are broken and they make
things bad although the are designed to help SIP over NAT.
Often this ALG are included in DSL modems (e.g. Alcatel). If this is the
case, try to disable the "SIP-Helper" in these devices. There may also
be a firewall at the ISP which does harm.
An often used workaround is to open an additional port at your SIP proxy
(e.g. port 5088) and configure the SIP clients to use this port. As most
SIP ALGs detect SIP messages simply by looking for UDP packet to port
5060, changing the port on the SIP proxy should help.
regards
klaus
Bruno Machado wrote:
Hi fellows.
We are in trouble with this "deceitful" error. I mean, errors. Look at
RURI. Our proxy receive this "thing". We have a number there! Sometimes,
this number is shown within the word REGISTER, like that:
"REGI:34846:STER". We can rewrite the URI, but Openser doesnt understand
the method "REGI:34846:STER". Second error: Via header. The REGISTER is
showing the NAT_DEVICE_IP instead UA_IP. And this VoIP isnt behind any
VoIP device! So, "who" are changing it? "Who" can does it? Is
possible
that some "device" between UA and our proxy change the headers intentionaly?
This kind of problem had been happening some months ago and began at the
same day to VoIPs were different regions of the country (Brazil). We
would like to know with someone already has face it.
Thank you all.
Bruno Machado
U NAT_DEVICE_IP:50764 -> PROXY_IP:5060
REGISTER :50764sip:proxy.com.br SIP/2.0
Via: SIP/2.0/UDP NAT_DEVICE_IP:50765;branch=z9hG4bK427600003ca00000
From: <sip:7011423@proxy.com.br>;tag=ab510000bf39ffff
To: <sip:7011423@proxy.com.br>
Contact: *
Call-ID: 499effff9ff20000(a)192.168.1.5
CSeq: 100 REGISTER
Expires: 0
User-Agent: Grandstream HT386 1.0.3.17
Max-Forwards: 70
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE
Content-Length: 0
U PROXY_IP:5060 -> NAT_DEVICE_IP:50765
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP NAT_DEVICE_IP:50765;branch=z9hG4bK427600003ca00000
From: <sip:7011423@proxy.com.br>;tag=ab510000bf39ffff
To:
<sip:7011423@proxy.com.br>;tag=22aae43fbf528d3860ded8429db379db.546f..Call-ID:
499effff9ff20000(a)192.168.1.5
CSeq: 100 REGISTER
Proxy-Authenticate: Digest realm="proxy.com.br",
nonce="44edfeda1fe71fa609e7599bf2513e999e3741dd"
Content-Length: 0
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