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19th February 2002 at 16:17 #21242VoipmanGuest
I am having a firewall issue with my new project.When I try to place phone calls to an extenal network,the firewall is blocking all UDP ports.Therefore,the calls do not go thru.Do anyone know a workaround for this?20th February 2002 at 06:45 #21243AlexGuest
What equipment are you using?
You need to find out what are the UDP ports used for signaling message communication between equipment. If you did, then configure the firewall equipment to allow those UDP ports to go through.. Hope this will help…21st February 2002 at 01:16 #21244RommelGuest
You also have to look at the RTP port range of the devices.
Here are general ports used:
RTP stream 16384-32767 (UDP)
either UDP or TCP 5060 for the signaling
A user agent MAY register with a local server on startup by sending a REGISTER request to the well-known “all SIP servers” multicast address “sip.mcast.net” (18.104.22.168).
Unicast GK Discovery 1718 UDP
Multicast GK discovery (UDP) 22.214.171.124
Registration/Status 1719 UDP
H.225.0 (call signaling for hosts) 1720 TCP
h245 is negotiated in the range of 11000 – 65535
MGCP version 0.1
MG and CA signalling – 2427 (UDP)
MGCP version 1.0
MG – 2427 (UDP)
CA – 2727 (UDP)21st February 2002 at 22:25 #21245VoipmanGuest
Do you know any good sites that I can research that on?23rd February 2002 at 01:04 #21246RommelGuest
I always just go to IETF to look up some of those things. Otherwise, I am really not sure where to go look anymore. I have been doing standards based VoIP since late 96′.24th February 2002 at 14:18 #21247JamesGuest
I would avoid using firewalls in your design as they increase latency. Consider using access lists on your routers instead.26th February 2002 at 01:33 #21248RommelGuest
ACLs work, but NAT and Firewalls are very big issues that need to be taken care of.
One issue with ACLs is scale, how do you manage this once you have 80 partners with 10000 gateways each.