asterisk - Elastix - No sound to external calls from sip phones connected through NAT -
we have provide remote partner 2 yealink sip phones can talk our hq , make external calls matters responsible.
the partner on different isp has static ip open ports him only.
the pbx behind firewall , have assign static ip , map ports 10000-20000 udp - tcp , port 5060 udp internal ip of pbx. have assign cid specific phones. phones register static have assigned. on sip extensions have nat=yes
i try describe problem , when happening
- between partner , hq calls ok (2 way audio) using 3 digit extension numbers.
- call outside on specific cid ok (2 way audio)
- call specific phones outside line partially working (1 way audio - hear customer not way around)
*we know isn't best approach , have in mind setup openvpn server secure connection.
try add specific public ip , local subnet range in sip.conf general section.
nat=yes externip=182.74.105.242 localnet=10.2.51.0/255.255.255.0 localnet=10.2.50.0/255.255.255.0 localnet=10.5.55.0/255.255.255.0
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