Chrome:
Offer1
{
  "v": 1,
  "id": "21c5a474249cbbda",
  "s": {
    "type": "offer",
    "sdp": "v=0\r\no=- 4727015153900916462 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=group:BUNDLE 0\r\na=extmap-allow-mixed\r\na=msid-semantic: WMS\r\nm=application 9 UDP/DTLS/SCTP webrtc-datachannel\r\nc=IN IP4 0.0.0.0\r\na=candidate:1600657949 1 udp 2113937151 19e60f27-7a6b-420b-b44b-80fb16b10d96.local 32922 typ host generation 0 network-cost 999\r\na=candidate:3858062446 1 udp 2113939711 5aa40abb-b5c3-46d4-8b1c-335f00f9d532.local 48316 typ host generation 0 network-cost 999\r\na=ice-ufrag:HJ3p\r\na=ice-pwd:8fF3fJMxF3Yci2HvNZOmd+6r\r\na=fingerprint:sha-256 0D:80:05:75:F9:5A:B6:CD:26:26:92:D8:04:1B:18:72:FA:AD:20:E6:AD:6F:B3:7F:F7:8D:2B:F1:36:8E:50:29\r\na=setup:actpass\r\na=mid:0\r\na=sctp-port:5000\r\na=max-message-size:262144\r\n"
  }
}
Answer1
{
  "v": 1,
  "id": "4c79fdc6b5e20f4f",
  "s": {
    "type": "answer",
    "sdp": "v=0\r\no=- 2426412120773230660 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=group:BUNDLE 0\r\na=extmap-allow-mixed\r\na=msid-semantic: WMS\r\nm=application 45330 UDP/DTLS/SCTP webrtc-datachannel\r\nc=IN IP4 192.168.0.99\r\na=candidate:1040060411 1 tcp 1518214911 192.168.0.99 9 typ host tcptype active generation 0 network-id 1 network-cost 10\r\na=candidate:2271431048 1 tcp 1518283007 2a02:8108:310d:b000:66c4:ed1c:57b0:194f 9 typ host tcptype active generation 0 network-id 2 network-cost 10\r\na=candidate:3277118319 1 udp 2122194687 192.168.0.99 45330 typ host generation 0 network-id 1 network-cost 10\r\na=candidate:2043256092 1 udp 2122262783 2a02:8108:310d:b000:66c4:ed1c:57b0:194f 50135 typ host generation 0 network-id 2 network-cost 10\r\na=ice-ufrag:jTj4\r\na=ice-pwd:JTgImK6tSV4XrFETX4d1NeWo\r\na=fingerprint:sha-256 10:FF:A7:A1:4D:C4:E6:C8:58:80:BE:DE:89:35:64:0F:08:46:5F:62:E4:9A:26:F8:35:6F:9D:23:9E:19:0A:5B\r\na=setup:active\r\na=mid:0\r\na=sctp-port:5000\r\na=max-message-size:262144\r\n"
  },
  "to": "21c5a474249cbbda"
}

Offer2
{
  "v": 1,
  "id": "ea8513afc96a66c4",
  "s": {
    "type": "offer",
    "sdp": "v=0\r\no=- 7345681585991935661 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=group:BUNDLE 0\r\na=extmap-allow-mixed\r\na=msid-semantic: WMS\r\nm=application 9 UDP/DTLS/SCTP webrtc-datachannel\r\nc=IN IP4 0.0.0.0\r\na=candidate:3682889654 1 udp 2113937151 2fbe1617-5bef-4389-8b86-0dc8d27f01fe.local 52239 typ host generation 0 network-cost 999\r\na=candidate:2532579650 1 udp 2113939711 ba3d54c5-0b01-4df0-b677-212617ca1994.local 38447 typ host generation 0 network-cost 999\r\na=ice-ufrag:DWlh\r\na=ice-pwd:bG1hiDVlwbvtyDoC/l5edXh1\r\na=fingerprint:sha-256 DF:A7:0F:3E:00:AA:7A:CB:E9:84:65:2F:8B:9D:E8:C1:39:A7:47:C3:DE:B8:72:CF:80:4A:4A:FA:1D:C5:EB:E5\r\na=setup:actpass\r\na=mid:0\r\na=sctp-port:5000\r\na=max-message-size:262144\r\n"
  }
}
Answer2
{
  "v": 1,
  "id": "2d22b7a296f92ab9",
  "s": {
    "type": "answer",
    "sdp": "v=0\r\no=- 628465681931269525 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=group:BUNDLE 0\r\na=extmap-allow-mixed\r\na=msid-semantic: WMS\r\nm=application 59397 UDP/DTLS/SCTP webrtc-datachannel\r\nc=IN IP4 192.168.0.99\r\na=candidate:811532240 1 tcp 1518214911 192.168.0.99 9 typ host tcptype active generation 0 network-id 1 network-cost 10\r\na=candidate:2328082851 1 tcp 1518283007 2a02:8108:310d:b000:66c4:ed1c:57b0:194f 9 typ host tcptype active generation 0 network-id 2 network-cost 10\r\na=candidate:3472108356 1 udp 2122194687 192.168.0.99 59397 typ host generation 0 network-id 1 network-cost 10\r\na=candidate:1953066295 1 udp 2122262783 2a02:8108:310d:b000:66c4:ed1c:57b0:194f 34097 typ host generation 0 network-id 2 network-cost 10\r\na=ice-ufrag:W4rw\r\na=ice-pwd:asUEGNATk7NDaiAl/qAa6lHX\r\na=fingerprint:sha-256 A8:78:40:79:2D:D9:F7:37:58:FD:1B:18:41:12:D2:2E:49:6D:1E:26:F3:6A:EC:E3:E5:9C:F7:BC:33:F6:81:79\r\na=setup:active\r\na=mid:0\r\na=sctp-port:5000\r\na=max-message-size:262144\r\n"
  },
  "to": "ea8513afc96a66c4"
}