Hello,
Just following up. Here is a link to a screen capture from Wireshark
that shows the extra byte in the Content Length header field of the
Register message.
http://signalogic.com/images/SMC7004VWBR_UDP_payload_with_SIP_message_gets_modified.jpg
We use an SMC7004VWBR router, but tech support at SMC said the router
does not support SIP. Has anybody else seen a router make such a mod to
a SIP message ?
Thanks and Regards,
Vikram.
Vikram Ragukumar wrote:
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.
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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