asterisk - SIP/2.0 500 Service Unavailable issue -

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i getting sip/2.0 500 service unavailable, created sip trunk nexmo server. status 200 ok. when call on trunk through mobile server getting sip response 500 "service unavailable" 119.xx.xx.x:5060. detailed log please go through attachment! appreciated.

enter image description here

did set freepbx server this: 

host=sip.nexmo.com type=friend insecure=port,invite qualify=yes allow=ulaw,alaw dtmfmode=rfc2833 fromuser=apikey secret=apisecret  register string apikey:apisecret@sip.nexmo.com

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