Problem with IP Telephony via RED in Standard/Split mode

Question

Hi all, 
 
 we have a problem in a remote office with RED15 and VoIP. The idea is to manage some IP ranges by UTM and all other traffic including VoIP is let straight to the Internet. 
 RED is configured in Standart/Split mode, "Split Networks" ranges are defined: 192.168.0.0/16, 213.197.184.11/32, 10.0.0.64/28 
 Is it possible that RED is blocking VoIP packets some way? In remote sight Internet cable is connected straight to RED device and VoIP phone is behind RED (no routers or etc.). This way IP phone is not working. If we connect phone device straight to Internet line - phone works fine. 
 ISP is giving an instructions what ports should be open: 
 Outbound Proxy (registration) xx.xxx.138.68 
 SIP IP range xx.xxx.138.64/29 
 RTP IP range xx.xxx.138.0/28 
 Port 5060 TCP/UDP 
 SIP ALG function should be off. 
 But, as far as i concerned, this in nothing to do with our UTM settings, because all this traffic should go straight to the Internet.. 
 Maybe some one already had similar problem, please HELP :) 
 Thanks. 
 BR, 
 Rimas

sachingurung · Answer

Hi Rimas, 
 Thanks for the information. What is 213.197.184.11/32, in the split network. I see many host added in the Split Networks box of the RED configuration. Make sure these are only local networks behind the UTM. If this settings are perfect then, I don't think the issue is from the UTM or the RED as the internet traffic never reaches the UTM. 
 Thanks