SIP2.0 401 Unauthorized response when dial 7777 to Asterisk

sip 7777I have a problem I am using voicepluse for my SIP service I have 2 numbers one is for voice and the other for fax. There was a problem on their endI have a problem I am using voicepluse for my SIP service I have 2 numbers one is for voice and the other for fax. There was a problem on their end