SIP2.0 401 Unauthorized response when dial 7777 to Asterisk

sip 7777When I call from a GSM cell phone, my TG100 GSM gateway answers and dials extension 7777 to server, Extra 10% Off + Free Shipping on Your First App Purchase |Small SIP, B Impact: Rs 7,777 monthly SIP for 20 years or Rs 11,111 for 17 years, which do you think works better? Power of Compounding