How to prevent "Toll Fraud through FXO lines"

To prevent toll fraud please follow below steps


Access-List
ip access-list extended 110
access-list 101 deny udp any any eq 2427 log
access-list 101 deny tcp any any eq 2428 log
access-list 101 deny tcp any any range 1718 1720 log
access-list 101 deny tcp any any eq 1731 log
access-list 101 deny tcp any any eq 2000 log
access-list 101 deny tcp any any eq 5060 log
access-list 101 deny udp any any eq 5060 log
access-list 101 permit ip any any

Next apply this access-list on the internet interface. It can be dialer in case of PPPoE internet and  FE in case of fixed IP broadband

ip access-group 110 in

Log is enabled to monitor the number of hits against each line. But if these logs increase CPU utilization then apply the access-list without log command in the end.

Port 5060 will be targeted more due SIP port.

UDP 2427 (MGCP)
TCP 2428 l (MGCP)
TCP 1718 1720 (H323)
TCP 1731 (MSICCP)
TCP 2000 (SCCP) SKiNNY  Cisco
TCP 5060 (SIP)
UDP 5060 (SIP)

Juniper SRX Firewall J-Web/GUI suddenly stops working.

Juniper SRX Firewall J-Web/GUI suddenly stops working.


If your Juniper FW J-Web was working and suddenly it not responding then to fix subjected issue please follow below command after doing ssh to your Juniper FX


restart web-management


Now try again!!!!
hopefully it will fix your problem.

Getting calls from your own Number

Getting calls from your own Number

Don't panic if you find an incoming call from your own number means the incoming number will be your own number.

Its a fake call, hackers are using Caller ID spoofing technique to change the incoming number to any number they want. Sometime this call will an automated voice or some time there will be a person pretending a business person, seller, bank person etc.

The target is to get your details, personal information, email or bank accounts password etc.

So how to protect such type of these attacks simply don't tell anything related to you not even your name or else Hang-Up and relax.

Getting error message "cucm unable to contact server master or local agent could be down" in DRS on Call Manager 8.5

ERROR

Getting error message "cucm unable to contact server master or local agent could be down" in DRS on Call Manager 8.5

SOLUTION

Restart service Cisco DRF Local on subscriber and run the manual backup to verify. It works for me hopefully help you also.

Share your inputs to help others.

Factory Reset of CISCO 7911, 7906 and 794x IP phone

To perform a FACTORY RESET
Note: The phone must be on a DHCP-enabled network before you can perform these steps.

Step 1 Unplug the power cable from the phone and then plug it back in.
The phone begins its power up cycle.

Step 2 While the phone is powering up, and before the speaker button flashes on and off,
press and hold #.

Continue to hold # until each line button flashes on and off in sequence in amber.

Step 3 Release # and press 123456789*0# in sequence to do proper factory reset.

After you press these keys, the line buttons on the phone flash red and the phone goes through the factory reset process. The process will take time to reset. During factory reset do not power down the phone until it completes the factory reset process and the main screen appears.

If the process take more than 10 minutes then inform your vendor about this.

Factory reset will  erased or reset to following to its default value

•CTL file—Erased
•User configuration settings—Reset to default values
•Network configuration settings—Reset to default values
•Call histories—Erased
•Locale information—Reset to default values
•Phone application—Erased (phone recovers by loading the term11.default.loads file)

Reset CISCO IP phone 7911, 7906 and 794x series by using erase softkey

Erase from Settings menu
Type on the phone :

•Goto Menu then settings
•then settings menu, PRESS **# ( to unlock the menu)
•PRESS more button
•PRESS erase button

After Resets user and network configuration settings to their default values, deletes the CTL file from the phone, and restarts the phone.

Erase from Network configuration menu
Type on the phone :

•Goto Menu then settings then network configuration
•then settings menu, PRESS **# ( to unlock the menu)
•PRESS more button
•PRESS erase button

Resets network configuration settings to their default values and resets the phone. (This method causes DHCP reconfigure the IP address of the phone.)


Erase from Security configuration menu
Type on the phone :

•Goto Menu then settings then Security configuration
•then settings menu, PRESS **# ( to unlock the menu)
•PRESS more button
•PRESS erase button

Deletes the CTL file from the phone and restarts the phone

How to reset your cisco phone 7941g and 7911

 

 

Basic reset of your cisco phone (7941g and 7911) -

 

From any screen (but not when the phone is idle), press **#**.

 

Resets any user and network configuration changes that you have made but that the phone has not written to its Flash memory to previously saved settings, then restarts the phone and main screen will appear.