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 is on 3g and SIPML5 client is on wifi, call is established but voice is not audible. Can you please help us what is the issue and how to fix. My Freeswitch server 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.com SIP/2.0
   Via: SIP/2.0/TCP 10.44.15.65:50583;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/OMA1.0 android-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 0 113 112 101 111 9
   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:4194994927 cname:a797995ff45befd0f562f852791dc543
   a=ssrc:4194994927 mslabel:6994f7d1-6ce9-4fbd-acfd-84e5131ca2e2
   a=ssrc:4194994927 label:doubango@audio
 
Regards
Vijaya