Hi , I have configured freeswitch server for making one-one call.I am making test call from IMSDroid(https://github.com/DoubangoTelecom/imsdroid) android client to SIPML5 client( i.e https://www.doubango.org/sipml5/call.htm#). When both are in the same wifi call is working. But when my android phone ison 3g and SIPML5 client is on wifi, call is established but voice is notaudible. Can you please help us what is the issue and how to fix. My Freeswitchserver is natted to a public IP. Following is the invite going from my android client.1004 user is SIPLM5 client and 1003 user is Android client. INVITE sip:1004@freeswitch.nowconfer.comSIP/2.0 Via: SIP/2.0/TCP10.44.15.65:50583;branch=z9hG4bK-600328989;rport From: <sip:1003@freeswitch.nowconfer.com>;tag=1909344009 To: <sip:1004@freeswitch.nowconfer.com> Contact: <sip:1003@10.44.15.65:50583;transport=tcp>;+g.oma.sip-im;language="en,fr";+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel" Call-ID: bfaff8ce-8a80-cbdc-c106-7713da878fcb CSeq: 571345640 INVITE Content-Type: application/sdp Content-Length: 905 Max-Forwards: 70 Accept-Contact:*;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel" Allow: INVITE, ACK, CANCEL, BYE, MESSAGE,OPTIONS, NOTIFY, PRACK, UPDATE, REFER Privacy: none User-Agent: IM-client/OMA1.0android-ngn-stack/v2.586.1328 (doubango r1328 - MotoG3) P-Preferred-Identity: <sip:1003@freeswitch.nowconfer.com> Supported: 100rel v=0 o=doubango 1983 678902 IN IP4 10.44.15.65 s=- c=IN IP4 10.44.15.65 t=0 0 a=tcap:1 RTP/AVPF m=audio 45812 RTP/AVP 98 97 8 0 113 112 101 1119 a=ptime:20 a=minptime:1 a=maxptime:255 a=silenceSupp:off - - - - a=rtpmap:98 SPEEX/16000/1 a=rtpmap:97 SPEEX/8000/1 a=rtpmap:8 PCMA/8000/1 a=rtpmap:0 PCMU/8000/1 a=rtpmap:113 AMR/8000/1 a=imageattr:113 octet-align=1 a=fmtp:113 octet-align=1 a=rtpmap:112 AMR/8000/1 a=imageattr:112 octet-align=0 a=fmtp:112 octet-align=0 a=rtpmap:101 telephone-event/8000/1 a=fmtp:101 0-16 a=rtpmap:111 opus/48000/2 a=fmtp:111 maxplaybackrate=16000;sprop-maxcapturerate=16000; stereo=0; sprop-stereo=0; useinbandfec=0; usedtx=0 a=rtpmap:9 G722/8000/1 a=pcfg:1 t=1 a=sendrecv a=rtcp-mux a=ssrc:4194994927cname:a797995ff45befd0f562f852791dc543 a=ssrc:4194994927mslabel:6994f7d1-6ce9-4fbd-acfd-84e5131ca2e2 a=ssrc:4194994927 label:doubango@audio RegardsVijaya