no video and audio

[prathibhacdac]

Soemtimes video and audio works. Most of the times there is no audio and video. I am using asterisk pjsip. My asterisk server is behind NAT.

[prathibhacdac]

Is it required to use TURN server?

[prathibhacdac]

As per the earlier communications with you, Asterisk in turn acts as the TURN server. In the configuration, if I don't give TURN server there is no audio and video.

[prathibhacdac]

Is there any settings I need to configure other than local_net, external_media_address and external_signaling_address for asterisk to work behind NAT?

[InnovateAsterisk]

Is it required to use TURN server?

It should not be, especially if you are using Asterisk.

Is there any settings I need to configure other than local_net, external_media_address and external_signaling_address for asterisk to work behind NAT?

It will depend on the NAT configuration. if you have 1:1 natting like at AWS, then you need to set RTP.conf (see bottom of file)
https://github.com/asterisk/asterisk/blob/master/configs/samples/rtp.conf.sample