your sip communication altogether. Have you tried changing IP address of your asterisk server? If changing IP works, then probably your provider has blocked you sip communication by IP only. Zeeshan A Zakaria -- www.ilovetovoip.com On 2010-09-23 7:22 AM, "bilal ghayyad" <bilmar_gh at yahoo.com> wrote: Hi All; I have my friend that use his mobile (Nimbuz) to connect for the Asterisk and his account was working fine. Suddenly it stop working (not able to register).