send 883 bytes to udp/[103.50.168.50]:46849 at 07:23:03.166391:
------------------------------------------------------------------------
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP 192.168.103.30:46849;branch=z9hG4bK-524287-1---0e342a14418bcca4;rport=46849;received=103.50.168.50
From: <sip:2112@52.221.122.187;transport=UDP>;tag=ee839502
To: <sip:3000@52.221.122.187>;tag=B4gvey7Ha1e1p
Call-ID: mdzZMAwx9AxiY9ax3MxA0A..
CSeq: 1 INVITE
User-Agent: FreeSWITCH-mod_sofia/1.8.6+git~20190606T190249Z~93b4c92e75~64bit
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Proxy-Authenticate: Digest realm="52.221.122.187", nonce="4ff129a0-1845-4036-bb10-8f88d20bbdef", algorithm=MD5, qop="auth"
Content-Length: 0
recv 813 bytes from udp/[103.50.168.50]:46849 at 07:23:03.165432:
------------------------------------------------------------------------
INVITE sip:3000@52.221.122.187;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 192.168.103.30:46849;branch=z9hG4bK-524287-1---0e342a14418bcca4;rport
Max-Forwards: 70
Contact: <sip:2112@103.50.168.50:46849;transport=UDP>
To: <sip:3000@52.221.122.187>
From: <sip:2112@52.221.122.187;transport=UDP>;tag=ee839502
Call-ID: mdzZMAwx9AxiY9ax3MxA0A..
CSeq: 1 INVITE
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, MESSAGE, OPTIONS, INFO, SUBSCRIBE
Content-Type: application/sdp
User-Agent: Zoiper rv2.9.27
Allow-Events: presence, kpml, talk
Content-Length: 254
v=0
o=Z 1577863381110 1 IN IP4 103.50.168.50
s=Z
c=IN IP4 103.50.168.50
t=0 0
m=audio 55560 RTP/AVP 3 101 110 97 8 0
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:110 speex/8000
a=rtpmap:97 iLBC/8000
a=fmtp:97 mode=20
a=sendrecv
_________________________________________________________________________Search your log for 'Choose rtp'; the IP number following this shows what FS will use for a media stream. There is a line like this for each stream. For your scenario, you want these not to be private IPs.If they are private, you can try to auto-reject them by changing acl.conf.xml. But you'll have limited success due to this bug https://github.com/signalwire/freeswitch/issues/157
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