[Kamailio-Users] Extra byte in Content-length header

[Klaus Darilion]

Am 10.02.2010 02:15, schrieb Vikram Ragukumar:
> Iñaki,
>
> Thank you for your response.
>
>> You could be behind a fu***** SIP-ALG enabled router rewritting SIP
>> requests "to fix the NAT".
>> To detect if you router has SIP-ALG enabled you can try various options:
>> 1) Ensure you are not using STUN in your client so the request
>> arriving to the proxy should contain client private address in Via and
>> Contact header.
>
> I have checked the Via and Contact headers and they do contain the
> client private address. I am using an SMC7004VWBR wireless router thats
> about 8 years old. I have checked all the router settings and do not see
> any option to enable/disable SIP ALG, so i presume the router is not
> capable of rewriting SIP headers.
>
> I will try your program out as another method of confirmation of the
> router's SIP ALG capability.
>
> I have found that this anomaly (extra byte in Contact-Length
> header)occurs only while sending to the proxy on a specific port(5060).
> By changing the port on which the proxy listens(7160), the
> Contact-length header field is ok.

This would indicate a SIP ALG.

Klaus

> Is there a list of routers out there that we know for sure that are not
> SIP ALG capable ?
>
> Once again, thanks for you suggestions.
> Regards,
> Vikram.
>
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