I need a developer who is proficient in pjsip, pjsip runs on opwnwrt, there is a problem with the sound.

Pjsip2.8 is tested with "pjsip-app/bin/pjsua-mipsel-unknown-elf" and the following error is generated during the call. Alsa_dev.c ca_thread_func: overrun! Alsa_dev.c pb_thread_func: underrun! Cpu occupancy reached 96%. I can provide ssh to let you log in remotely. Codes is wm8960，Alsa drive is ok, I can play music with madplay Can anyone help me find out why? The operating environment is OpenWrt Chaos Calmer 15.05.1 The CPU is MT7628 (580Mhz 64M RAM), you only need to help me find the cause of the error until the sound is normal and support webrtc aec.