I have a grandstream model UCM 65 10 that reboots and connects the voip trunks very well. however after some minutes, the registration refresh is not working properly.
need help:
this is the error message in the asterisk logs
WARNING[1923] chan_sip.c: Timeout on 896482223-292013357-1450912169 on non-critical invite transaction.
This might be a NAT issue where VOIP freepbx server is unable to contact the trunk provider and I am able to have a look and suggest the fix.
Please go through my past VoIP projects and customer feedback nine years of time
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