#Offer from Android (by webrtc.org library):
v=0
o=- 5728876668167601575 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio video
a=msid-semantic: WMS ARDAMS
m=audio 9 RTP/SAVPF 111 103 9 102 0 8 106 105 13 127 126
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:nEhT7P/F24BeBDoB
a=ice-pwd:jnVtYxo22sUqQ5QnSyyfZdsY
a=fingerprint:sha-1 0C:49:3B:CA:9E:CD:43:B7:40:20:AC:0A:4D:E1:E7:44:87:92:E5:E1
a=setup:actpass
a=mid:audio
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=sendrecv
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=fmtp:111 minptime=10; useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:9 G722/8000
a=rtpmap:102 ILBC/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:127 red/8000
a=rtpmap:126 telephone-event/8000
a=maxptime:60
a=ssrc:3730323322 cname:I5IDYTbgReozOmpK
a=ssrc:3730323322 msid:ARDAMS ARDAMSa0
a=ssrc:3730323322 mslabel:ARDAMS
a=ssrc:3730323322 label:ARDAMSa0
a=candidate:1871046784 1 udp 2122129151 192.168.128.249 51069 typ host generation 0
a=candidate:1871046784 2 udp 2122129151 192.168.128.249 51069 typ host generation 0
a=candidate:554046576 1 tcp 1518149375 192.168.128.249 53912 typ host tcptype passive generation 0
a=candidate:554046576 2 tcp 1518149375 192.168.128.249 53912 typ host tcptype passive generation 0
m=video 9 RTP/SAVPF 100 116 117 96
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:nEhT7P/F24BeBDoB
a=ice-pwd:jnVtYxo22sUqQ5QnSyyfZdsY
a=fingerprint:sha-1 0C:49:3B:CA:9E:CD:43:B7:40:20:AC:0A:4D:E1:E7:44:87:92:E5:E1
a=setup:actpass
a=mid:video
a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=sendrecv
a=rtcp-mux
a=rtpmap:100 VP8/90000
a=rtcp-fb:100 ccm fir
a=rtcp-fb:100 nack
a=rtcp-fb:100 nack pli
a=rtcp-fb:100 goog-remb
a=rtpmap:116 red/90000
a=rtpmap:117 ulpfec/90000
a=rtpmap:96 rtx/90000
a=fmtp:96 apt=100
a=ssrc-group:FID 4043084481 952591881
a=ssrc:4043084481 cname:I5IDYTbgReozOmpK
a=ssrc:4043084481 msid:ARDAMS ARDAMSv0
a=ssrc:4043084481 mslabel:ARDAMS
a=ssrc:4043084481 label:ARDAMSv0
a=ssrc:952591881 cname:I5IDYTbgReozOmpK
a=ssrc:952591881 msid:ARDAMS ARDAMSv0
a=ssrc:952591881 mslabel:ARDAMS
a=ssrc:952591881 label:ARDAMSv0
a=candidate:1871046784 1 udp 2122129151 192.168.128.249 51069 typ host generation 0
a=candidate:1871046784 2 udp 2122129151 192.168.128.249 51069 typ host generation 0
a=candidate:554046576 1 tcp 1518149375 192.168.128.249 53912 typ host tcptype passive generation 0
a=candidate:554046576 2 tcp 1518149375 192.168.128.249 53912 typ host tcptype passive generation 0




#Offer received in Chrome from FreeSwitch:
v=0
o=FreeSWITCH 1426145176 1426145177 IN IP4 192.168.131.253
s=FreeSWITCH
c=IN IP4 192.168.131.253
t=0 0
a=msid-semantic: WMS cmSQsnGZmAjyQE9LSdNN71eThgHwKa1N
m=audio 16386 RTP/SAVPF 111 9 0 8 101 13
a=rtpmap:111 opus/48000/2
a=fmtp:111 minptime=10; useinbandfec=1
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fingerprint:sha-256 34:46:35:C3:98:97:79:67:E8:B9:5F:FF:82:C4:EE:4E:2D:CA:DE:46:BD:B2:6D:D5:A6:07:C9:26:5B:3F:AE:10
a=rtcp-mux
a=rtcp:16386 IN IP4 192.168.131.253
a=ssrc:1024766842 cname:mKuFX0u9qEy78yIQ
a=ssrc:1024766842 msid:cmSQsnGZmAjyQE9LSdNN71eThgHwKa1N a0
a=ssrc:1024766842 mslabel:cmSQsnGZmAjyQE9LSdNN71eThgHwKa1N
a=ssrc:1024766842 label:cmSQsnGZmAjyQE9LSdNN71eThgHwKa1Na0
a=ice-ufrag:CluAdzjkFQHfRzT4
a=ice-pwd:9dzX3UXkolinKQ4c2pC6OMhk
a=candidate:8906128254 1 udp 659136 192.168.131.253 16386 typ host generation 0
a=candidate:8906128254 2 udp 659136 192.168.131.253 16386 typ host generation 0
a=ptime:20
m=video 16388 RTP/SAVPF 100
b=AS:256
a=rtpmap:100 VP8/90000
a=fingerprint:sha-256 34:46:35:C3:98:97:79:67:E8:B9:5F:FF:82:C4:EE:4E:2D:CA:DE:46:BD:B2:6D:D5:A6:07:C9:26:5B:3F:AE:10
a=rtcp-mux
a=rtcp:16388 IN IP4 192.168.131.253
a=rtcp-fb:100 ccm fir
a=ssrc:311706813 cname:mKuFX0u9qEy78yIQ
a=ssrc:311706813 msid:cmSQsnGZmAjyQE9LSdNN71eThgHwKa1N v0
a=ssrc:311706813 mslabel:cmSQsnGZmAjyQE9LSdNN71eThgHwKa1N
a=ssrc:311706813 label:cmSQsnGZmAjyQE9LSdNN71eThgHwKa1Nv0
a=ice-ufrag:r8kiofwWRbcruXG5
a=ice-pwd:cZIuIMxYd8z7nQ7EPhM3m9P4
a=candidate:8142942344 1 udp 659136 192.168.131.253 16388 typ host generation 0
a=candidate:8142942344 2 udp 659134 192.168.131.253 16388 typ host generation 0




#Answer generated in Chrome:
v=0
o=- 1379360262027728742 2 IN IP4 127.0.0.1
s=-
t=0 0
a=msid-semantic: WMS imsh1etBhqjVisP1YbY3IW5ML1FrCLyPVD5S
m=audio 41747 RTP/SAVPF 111 9 0 8 101 13
c=IN IP4 192.168.131.253
a=rtcp:9 IN IP4 0.0.0.0
a=candidate:211962667 1 udp 2122260223 10.0.3.1 41747 typ host generation 0
a=candidate:896282172 1 udp 2122194687 192.168.131.253 58504 typ host generation 0
a=candidate:2441410931 1 udp 2122129151 172.17.42.1 45609 typ host generation 0
a=candidate:868527874 1 udp 1686052607 192.168.131.253 41747 typ srflx raddr 10.0.3.1 rport 41747 generation 0
a=candidate:953906854 1 udp 1685921535 192.168.131.253 45609 typ srflx raddr 172.17.42.1 rport 45609 generation 0
a=candidate:1109506011 1 tcp 1518280447 10.0.3.1 0 typ host tcptype active generation 0
a=candidate:2079314636 1 tcp 1518214911 192.168.131.253 0 typ host tcptype active generation 0
a=candidate:3741779331 1 tcp 1518149375 172.17.42.1 0 typ host tcptype active generation 0
a=ice-ufrag:4IDqem5vOr15nQSg
a=ice-pwd:5+LtaRvHaFdEv7+vUDnP8Ofl
a=fingerprint:sha-256 52:8C:0F:27:C6:D6:CF:AE:F4:87:AC:AE:DF:7B:9B:B2:75:90:60:6A:2A:82:09:98:AD:04:0B:35:45:6A:13:A2
a=setup:active
a=mid:audio
a=sendrecv
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=fmtp:111 minptime=10; useinbandfec=1
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=rtpmap:13 CN/8000
a=maxptime:60
a=ssrc:982941744 cname:MMvCy0RouNFfAfdZ
a=ssrc:982941744 msid:imsh1etBhqjVisP1YbY3IW5ML1FrCLyPVD5S e4bf2510-f73a-4df4-8cfe-5308a89ca8f7
a=ssrc:982941744 mslabel:imsh1etBhqjVisP1YbY3IW5ML1FrCLyPVD5S
a=ssrc:982941744 label:e4bf2510-f73a-4df4-8cfe-5308a89ca8f7
m=video 36031 RTP/SAVPF 100
c=IN IP4 192.168.131.253
a=rtcp:9 IN IP4 0.0.0.0
a=candidate:211962667 1 udp 2122260223 10.0.3.1 36031 typ host generation 0
a=candidate:896282172 1 udp 2122194687 192.168.131.253 35064 typ host generation 0
a=candidate:2441410931 1 udp 2122129151 172.17.42.1 37784 typ host generation 0
a=candidate:868527874 1 udp 1686052607 192.168.131.253 36031 typ srflx raddr 10.0.3.1 rport 36031 generation 0
a=candidate:953906854 1 udp 1685921535 192.168.131.253 37784 typ srflx raddr 172.17.42.1 rport 37784 generation 0
a=candidate:1109506011 1 tcp 1518280447 10.0.3.1 0 typ host tcptype active generation 0
a=candidate:2079314636 1 tcp 1518214911 192.168.131.253 0 typ host tcptype active generation 0
a=candidate:3741779331 1 tcp 1518149375 172.17.42.1 0 typ host tcptype active generation 0
a=ice-ufrag:JopYjvWKl1fi3YnD
a=ice-pwd:FWkLjxPvcbF7QRDLW9ML5tc8
a=fingerprint:sha-256 52:8C:0F:27:C6:D6:CF:AE:F4:87:AC:AE:DF:7B:9B:B2:75:90:60:6A:2A:82:09:98:AD:04:0B:35:45:6A:13:A2
a=setup:active
a=mid:video
a=sendrecv
a=rtcp-mux
a=rtpmap:100 VP8/90000
a=rtcp-fb:100 ccm fir
a=ssrc:1880102335 cname:MMvCy0RouNFfAfdZ
a=ssrc:1880102335 msid:imsh1etBhqjVisP1YbY3IW5ML1FrCLyPVD5S 05869856-a385-424a-8817-d3d748823465
a=ssrc:1880102335 mslabel:imsh1etBhqjVisP1YbY3IW5ML1FrCLyPVD5S
a=ssrc:1880102335 label:05869856-a385-424a-8817-d3d748823465


#Answer received in Android from FreeSwitch:
v=0
o=FreeSWITCH 1426145178 1426145179 IN IP4 192.168.131.253
s=FreeSWITCH
c=IN IP4 192.168.131.253
t=0 0
a=msid-semantic: WMS BNo1VQAJroxehgCTF0uKs9k3EUdBEDL5
m=audio 16384 RTP/SAVPF 111 126 106
a=rtpmap:111 opus/48000/2
a=fmtp:111 useinbandfec=1; minptime=10
a=rtpmap:126 telephone-event/8000
a=rtpmap:106 CN/8000
a=ptime:20
a=fingerprint:sha-1 73:08:7C:79:1F:8F:5A:E7:4B:C1:D7:05:EA:4D:98:F3:36:46:39:72
a=rtcp-mux
a=rtcp:16384 IN IP4 192.168.131.253
a=ssrc:1024631706 cname:g0X2GoBYCY2J5usA
a=ssrc:1024631706 msid:BNo1VQAJroxehgCTF0uKs9k3EUdBEDL5 a0
a=ssrc:1024631706 mslabel:BNo1VQAJroxehgCTF0uKs9k3EUdBEDL5
a=ssrc:1024631706 label:BNo1VQAJroxehgCTF0uKs9k3EUdBEDL5a0
a=ice-ufrag:lMaDMkwg5zIz3kv9
a=ice-pwd:aj2HxtvZiozdJSEUvEn7PKdL
a=candidate:8379233368 1 udp 659136 192.168.131.253 16384 typ host generation 0
m=video 16390 RTP/SAVPF 100
b=AS:256
a=rtpmap:100 VP8/90000
a=fingerprint:sha-1 73:08:7C:79:1F:8F:5A:E7:4B:C1:D7:05:EA:4D:98:F3:36:46:39:72
a=rtcp-mux
a=rtcp:16390 IN IP4 192.168.131.253
a=rtcp-fb:* fir
a=rtcp-fb:100 ccm fir
a=ssrc:311571677 cname:g0X2GoBYCY2J5usA
a=ssrc:311571677 msid:BNo1VQAJroxehgCTF0uKs9k3EUdBEDL5 v0
a=ssrc:311571677 mslabel:BNo1VQAJroxehgCTF0uKs9k3EUdBEDL5
a=ssrc:311571677 label:BNo1VQAJroxehgCTF0uKs9k3EUdBEDL5v0
a=ice-ufrag:afvyUrPqxfjH9tPf
a=ice-pwd:snn0NUc6MAcrFkqGqM5a3Krr
a=candidate:6545229027 1 udp 659136 192.168.131.253 16390 typ host generation 0