01-20-2016 10:15 PM - edited 03-17-2019 05:35 AM
Hi
I have CME with two IP Phone
IP Phone1: 172.16.15.5
CME: 172.16.15.6
IP Phone2: 10.10.10.2
IP Phone2 have 10.10.10.2 and after NAT have 172.16.15.8, the problem I faced is the phone 2 can ring but not receive any Media only send,
How I make Phone2 receive the RTP Media?,
Thanks
01-20-2016 10:36 PM
Hi,
Are they two subnets on same router or different sites? With natting there are very limited options to get media working. Therefore, I suggest to avoid it
01-20-2016 10:39 PM
It is two sites, I can't avoid NAT, is there any workaround..
01-20-2016 11:09 PM
Are both sites using same CME or two CMEs with trunk between them (e.g. SIP Trunk). If SIP trunk is used, then the solution will be enabling nat detection on both CMEs using the config
sip-ua
nat symmetric check-media-src
01-20-2016 11:37 PM
Both site using same CME
01-20-2016 11:46 PM
In this case nat won't work. You need to have SIP trunk between CMEs to get nat working with the feature I mentioned.
A work around is to register phone 2 to CME using natted IP not the original IP. This case CME won't know the original IP and will ask phone 1 to send rtp stream natted IP
01-20-2016 11:50 PM
How I make Phone2 registered in CME using natted IP?
01-20-2016 11:59 PM
01-21-2016 12:23 AM
Hi,
This is a routing config using combination of nat, local policy route map and loopback. It will do natting for phone IP before it hits cme.
I thought about one more thing, are you using ephones. If so, apply the command mtp under each ephone and reset the phones then test
01-21-2016 01:44 AM
i used SIP Phone not sccp, is there any config. i can do in CME or sip phone to allow using nat ip for phone to solve issue?
01-22-2016 10:56 AM
if possible to give me steps, How I can fix this issue?
01-20-2016 11:37 PM
SIP & NAT don't work.
Can you use, say, an IPSEC VPN between the two systems?
GTG
01-20-2016 11:40 PM
Hi
I tried asterisk with soft-phones SIP same scenario, and it works fine!!
Thanks
01-20-2016 11:51 PM
Asterix is probably using a system such as STUN. Not sure if CME (or CUCM) supports STUN.
GTG
01-20-2016 11:54 PM
Hi
Is the STUN will work if there is not Internet?
Thanks
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