i use jssip to make video call will get frame drop

[q7w8e9123456]

i use jssip to make video call will be a high chance of getting a serious frame drop.

i used freeSwitch and jssip to make video call codec is use h264
and i has some processing is done for each frame

peerConnectionInboundMonitorStats: {"bitrateKbs":352.83840000000004,"decodeTime":11.169202455435265,"firCount":0,"frameHeight":960,"frameWidth":540,"framesDecoded":11361,"framesDropped":2908,"framesPerSecond":12,"framesReceived":14281,"headerBytesReceived":642744,"jitter":0.056,"jitterBufferDelay":7920.577,"jitterBufferEmittedCount":14192,"keyFramesDecoded":926,"lastPacketReceivedTimestamp":2147483647,"nackCount":0,"packetsLost":0,"packetsReceived":53562,"pliCount":1,"qpSum":344541,"totalDecodeTime":1017.172,"totalInterFrameDelay":1149.576999999996,"totalSquaredInterFrameDelay":215.21597500000996}

peerConnectionInboundMonitorStats: {"bitrateKbs":401.0512,"decodeTime":11.162404699216404,"firCount":0,"frameHeight":960,"frameWidth":540,"framesDecoded":11379,"framesDropped":2963,"framesPerSecond":14,"framesReceived":14356,"headerBytesReceived":645744,"jitter":0.058,"jitterBufferDelay":7992.538,"jitterBufferEmittedCount":14251,"keyFramesDecoded":929,"lastPacketReceivedTimestamp":2147483647,"nackCount":0,"packetsLost":0,"packetsReceived":53812,"pliCount":1,"qpSum":345157,"totalDecodeTime":1019.404,"totalInterFrameDelay":1154.7999999999956,"totalSquaredInterFrameDelay":217.31690600001005}

this is every 5 sec i print log
Compare the first with the second and i get receivedFrames: 75, dropFrames: 55

so i don't know why i will got so high frame drop and i will see my video has delay and Stuck