firewalls and OBI, Callcentric, GV and dd-wrt w/SPI
winterescape:
I have my OBI110 plugged into my WRT54GL running dd-wrt Firmware: DD-WRT v24-sp2 (10/10/09) mini
An issue we had recently resulted in this response from CallCentric tech support:
“As far as the issue is concerned, as mentioned for a few of your calls from your calling history, we are showing that several of your calls were dropping improperly, specifically we are showing that your calls are dropping with the cause code "No response to BYE". This basically means is that while a BYE packet was sent to your Obi110 (a BYE packet essentially signals your Obi110 to drop the call) we did not receive any sort of acknowledgement from your Obi110 stating that it received it (which it should). This can be caused by a number of reason, specifically a networking issue, as in while a BYE packet was sent to your Obi110, somewhere along the network flow, it is being dropped/ filtered; and we believe this is causing your calls to get "stuck".
You've mentioned that you have a router running DD-WRT; if you would, please try disabling Stateful Packet Inspection (SPI), within your router's firewall/ security configurations; as this setting has been known to have a negative effect on SIP/VoIP communications in general.”
I am very concerned about disabling my firewall, should I just place the OBI in the “DMZ” or do you have specific router settings that are recommended for the OBI?
Thanks in advance for any suggestions or advise…
RonR:
I recently noticed a problem with BYE's not terminating SIP sessions properly and reported the problem along with a supporting Syslog to Obihai on 11/2. In my case, all participants were on the same LAN, so no firewalls or other filtering was in the path. On 11/3, I received a reply saying they were looking into this, but I haven't heard anything since. I'd hold off making any changes to your router as this may very well be the result of a bug in the OBi firmware.
winterescape:
Thanks for that Info, that is very interesting ...
Any good reference for general firewall/router configurations for optimal performance? Do most people place the OBI in the "DMZ"?
RonR:
In most cases, there is no need to make any changes. Sometimes, forwarding SIP and RTP ports might be needed, but it's not always the case. If you're not having calling problems, I would be concerned.
winterescape:
Any idea when this firmware update to address this issue will be available?
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