to much delays on GSM network

[alexzh16]

Hi, can me please explain why on GSM network to much delays is.

[ +48 ms] flutter: Connection state change: RTCPeerConnectionState.RTCPeerConnectionStateConnecting

[log] Got new remote ICE candidate: {"sdpMLineIndex":0,"candidate":"candidate:3812186068 1 udp 2122260223 xx.xxx.xx.01 56282 typ host generation 0 ufrag s8Us network-id 1 network-cost 10","sdpMid":"0"}
[log] ******************************************************************* > CallState.CallStateConnecting
[log] Got new remote ICE candidate: {"sdpMLineIndex":0,"candidate":"candidate:1033199820 1 udp 2122194687 xx.xxx.xx.02 55813 typ host generation 0 ufrag s8Us network-id 12 network-cost 900","sdpMid":"0"}
[log] Got new remote ICE candidate: {"sdpMLineIndex":0,"candidate":"candidate:2539441712 1 udp 2122129151 xx.xxx.xx.03 59545 typ host generation 0 ufrag s8Us network-id 13 network-cost 900","sdpMid":"0"}
[log] Got new remote ICE candidate: {"sdpMLineIndex":0,"candidate":"candidate:3815604218 1 udp 2122063615 xx.xxx.xx.04 50734 typ host generation 0 ufrag s8Us network-id 14 network-cost 900","sdpMid":"0"}
[log] Got new remote ICE candidate: {"sdpMLineIndex":0,"candidate":"candidate:3815604218 1 udp 2121998079 xx.xxx.xx.05 52630 typ host generation 0 ufrag s8Us network-id 2 network-cost 50","sdpMid":"0"}
[log] Got new remote ICE candidate: {"sdpMLineIndex":0,"candidate":"candidate:3815604218 1 udp 2121932543 xx.xxx.xx.05 63137 typ host generation 0 ufrag s8Us network-id 3 network-cost 50","sdpMid":"0"}
xxxx......n hoops
[log] Got new remote ICE candidate: {"sdpMLineIndex":0,"candidate":"candidate:2902040058 1 udp 41819903 COTURN-IP-01 59437 typ relay raddr xx.GSM-MY-IP.xx rport 16562 generation 0 ufrag s8Us network-id 12 network-cost 900","sdpMid":"0"}

[+17458 ms] flutter: ICE gather / connection state change: RTCIceGatheringState.RTCIceGatheringStateComplete

[ +203 ms] flutter: Connection state change: RTCPeerConnectionState.RTCPeerConnectionStateConnected

Test with https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/ :

Time | Component | Type | Foundation | Protocol | Address | Port | Priority | Mid | MLine Index | Username Fragment
0.063 | rtp | relay | 2902040058 | udp | COTURN-IP-01 | 54638 | 2 | 32542 | 255 | 0 | 0 | 3y4d
0.109
0.109 | Done