My SIP baed Internet phone is stop working

Question

hi all,
It would be great if someone give me an insight of this problem. Two days ago, Signaling/Registration of phone were failed. I thought Verizon might apply some Access-list rules for SIP related traffic. i try to change port fowording/dmz and all other stuff. but so far no luck.
So, My question is that does Verizon really decide to block SIP traffic??? this is real pain.
Could you anyone know how to make this work, please share something for me.
Btw, how to check port connectivity for UDP 5060, 20000-60000?
thanks

Answer 1

Satellite wrote:
I have same problem since around June 22...I'm using internet phone which using 5060, 20000-60000 port with actiontec M1424WR router. Since then, internet is fine but my phone is not working.
I tried port forwarding/DMZ but nothing helped.
I checked some routes...
Tracing route to lgdacom.net [210.124.165.161]
1 2 ms <1 ms <1 ms Wireless_Broadband_Router.home [192.168.1.1]
2 10 ms 7 ms 9 ms L100.BLTMMD-VFTTP-41.verizon-gni.net [173.64.116.1]
3 18 ms 18 ms 18 ms G0-5-0-6.BLTMMD-LCR-21.verizon-gni.net [130.81.109.186]
4 20 ms 18 ms 19 ms ae4-0.RES-BB-RTR1.verizon-gni.net [130.81.209.230]
5 88 ms 87 ms 87 ms 0.so-7-0-1.XL4.LAX15.ALTER.NET [152.63.1.242]
#1 is ok which is my router, but the problem is #2 and #3...port 5060 closed...
>nmap -sU -p 5060 173.64.116.1
Nmap scan report for L100.BLTMMD-VFTTP-41.verizon-gni.net (173.64.116.1)
Host is up (0.013s latency).
PORT STATE SERVICE
5060/udp closed sip
Any help?
Has your phone traffic always needed to go to South Korea (looks like it's going to Seoul)? Even with latency that high, SIP should work fine assuming there isn't a latency enforcement. As an FYI, a port check tool won't work unless you're hosting a SIP server from your home. Your computer uses an ephemeral port (a random port from ~port 30,000 to 65535) to connect to the server on the other end, with the SIP port that is actually open.
Also, Verizon's core routers won't have ports open, since they are not actually running services themselves. Internally they'll have something but you shouldn't be able to reach any of that.
One consideration is to try disabling your IGMP proxy in the router. For as silly as it seems, this seems to have been fixing a ton of issues lately. Also, just double check to make sure your router's Firewall is not enabled or set too high. You can also try disabling SIP ALG if there is an "ALG" section in the FiOS router. For the IGMP Proxy, check this link out: http://192.168.1.1/index.cgi?active_page=6059
You will need to log into the above link using your router's username of admin, and the serial number as the password unelss you've changed it.
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