How to set ice server in mongooseim.cfg

[maguon]

MongooseIM version 3.5.0 MongooseICE version 0.4.0 MongooseICE has been start with port 3478. udp 0 0 127.0.0.1:3478 0.0.0.0:*

I found the ejabberd_stun options in mongoose.cfg,but I don't know how to set it. %%,{ {3478, udp}, ejabberd_stun, []}

I try to find some tips in source code ,but souce code have no "ejabberd_stun" .

[maguon]

mongooseimctl live I found notice in log : 16:29:03.729 [notice] Skipping STUN stun.voxgratia.org 16:29:03.729 [notice] STUN could not find external IP!!

but when I execute the command mongooseimctl live I found the stun notice is different with last time. 16:33:13.482 [info] Checking STUN stun.freeswitch.org :0: Warning: export_all flag enabled - all functions will be exported

why the stun server has been changed .

Thanks.