"SIP Scanners" are bots or hacker tools that send SIP traffic all over the Internet on a continual basis looking for SIP vulnerabilities. The SIP traffic is often SIP "INVITE" packets which can reach your PBX, phone, or SIP software and causing it to ring. When you answer, no one is there. Often the caller ID shows a number like 1000, 123456789, or 00000.


Please note: These calls are not coming from Google Voice or Google Voice Gateway! This is random traffic from the Internet, and blocking the caller ID in Google Voice will not help.


To solve the problem, you need to get your device out of the path of the scanners using any of these methods:

  • Firewall restrictions
  • Using non-standard SIP ports
  • Using SIP routing rules to reject the bogus calls and only route wanted calls to your phone



Thanks to Taoman on the Obihai forums, here is a guide for setting both a routing rule and changing your SIP port on an Obihai device:


You're getting hit by SIP scanners. Either of the following solutions should fix the problem:


1>Using OBi Expert, change Voice Services-->SPy Service-->X_InboundCallRoute to the following:


{>('GV1XXXXXXXXXX'):ph} (This is using your "SIP Login/prefix" as seen on your Simonics web page)


y=SP service number (SP1, SP2, SP3, or SP4 under Voice Services) being used for Simonics

XXXXXXXXXX=Google Voice number



2>Using OBi Expert, change Voice Services-->SPy Service-->X_UserAgentPort to a random number between 10000 and 65535, for example, 55120.


y=SP service number (SP1, SP2, SP3, or SP4 under Voice Services) being used for Simonics


Important: You must uncheck both boxes to the right of the field you are trying to edit. Make the change in the exact order shown below. You can't do Step 2 until you do Step 1 first.


Step 1: Uncheck box under OBiTALK Settings for the field you wish to edit


Step 2: Uncheck box under Device Default for the field you wish to edit


Step 3: Edit the field you wish to change


Step 4: Submit and save your settings