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Latest Articles
Configure Cisco unified border element (CUBE) gateway 2
November 28, 2019
Configure CUBE Protocol Interworking Command To enable protocol interworking, use the allow-connections from-type to to-type command in voice service configuration mode. The from-type and to-type options specify the signaling protocols, as detailed in Table 9-2. Table 9-2 allow-connections Syntax Description Parameter Description from-type Originating endpoint type. The following choices are valid: h323—H.323 sip—SIP To...
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IPBAN – Windows
November 26, 2019
In Linux we can use fail2ban to prevent brute attack based on the login failure attempt. Windows has a similar tool called IPBAN. The tool can be downloaded from github. Requirement Check your windows version, only windows 8.1 or newer, windows server 2012 or newer. Windows Server 2008 does a poor job of logging ip...
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Voice Signalling protocols 1 – SIP
November 21, 2019
Voice Signaling protocol: SIP Session Initiation Protocol (SIP) is one of the most important voice signaling protocols within service provider VoIP networks and is supported by most IP telephony system vendors. As such, it is an ideal protocol for interconnecting different VoIP systems and networks. SIP operates on the principle of session invitations that are...
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Configure basic VoIP 1 (stages of VoIP, RTP, VAD)
November 20, 2019
Major Stages of Voice Processing in VoIP For voice transmission over an IP network, the voice wavelength must be sampled, quantized, encoded, optionally compressed, and then encapsulated in a VoIP packet. The first four steps are performed by a digital signal processor (DSP) in the originating gateway and are detailed in the following section....
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VoIP Essential 2 (Codecs, DSPs )
November 18, 2019
Codecs A codec is a device or program capable of performing encoding and decoding on a digital data stream or signal, which works on presentation layer in VoIP. Various types of codecs are used to encode and decode or compress and decompress data that would otherwise use large amounts of bandwidth on WAN links....
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Prevent DDoS on Network Devices
November 13, 2019
Rate Limiting With some types of DoS attacks, there’s not much you can do to stop the flow of the attack, especially in a distributed DoS (DDos) attack in which the hacker is spoofing the source addresses and using an unsuspecting company or ISP as the reflector in the attack. Tracing this kind of...
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Cisco AP Discovery and Join WLAN controller
November 7, 2019
Access point (AP) registration consists of a discovery and join process. Registration is the first step in getting your wireless network up and running. If you understand how the discovery and join process works, your job will be much easier when you have to troubleshoot it. One of the major selling points of the AP and...
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Cisco WLAN AP placement
November 7, 2019
The APs would be connected to your access layer switches in a management or other isolated VLAN to keep the APs from having to process unnecessary packets. Another consideration is how to deploy the APs per controller on the network if you will have more than one. A common deployment is known as a salt-and-pepper or...
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MAC reference machine build and imaging (10.14 Mojave)
November 1, 2019
Dock standardrize Login as a local admin, build a reference dock. Open Terminal type sudo -s Enter your current account’s password when prompted Copy the modified dock preference file to the User Template in your Mac’s System folder:cp ~/Library/Preferences/com.apple.dock.plist /System/Library/User\ Template/en_AU.lproj/Library/Preferences/Note the en_AU is your system lanuguage preference, you can find it in the system...
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Apple Profile manager pending
October 29, 2019
The Profile manager does not push APP/Settings to Enrolled Devices Network requirement: To use Profile Manager, you should make sure that the following ports are open on your network. Port Incoming or Outgoing TCP/UDP Description 2195, 2196 Outgoing TCP Used by Profile Manager to send push notifications 5223 Outgoing TCP Used to maintain a...
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MAC usuful commands
October 29, 2019
switch on/off wifi: networksetup -setairportpower en1 off login script: sudo defaults write com.apple.loginwindow LoginHook /path/to/script To Check it sudo defaults read com.apple.loginwindow To remove this hook, delete the property: sudo defaults delete com.apple.loginwindow LoginHook Troubleshoot: use grep LogoutScript /var/log/system.log Untick the “Auto Proxy Discovery” Networksetup -setproxyautodiscovery Ethernet off Clean up messy open with...
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fail2ban configure with Apache, SSH,
October 25, 2019
OS: CentOS 7 Configure fail2ban Configure Fail2ban Fail2ban reads .conf configuration files first, then .local files override any settings. Because of this, all changes to the configuration are generally done in .local files, leaving the .conf files untouched. Configure fail2ban.local fail2ban.conf contains the default configuration profile. The default settings will give you a reasonable working setup. If you want to make any changes,...
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Windows server install error 0x80070570
October 22, 2019
Recently Bought a new Server with below specs: Dell R740 32GB RDIMM, 2933MT/s X 8 Intel Xeon Silver 4210 2.2G, 1 0C/20T, 9.6GT/s, 13.75M Cache, Turbo, HT (85W) DDR4-2400 NVIDIA Tesla P40 24GB GPU, Pas sive Dell 6.4TB, NVMe, Mixed Use Ex press Flash, HHHL AIC, PM1725b x 2 build with Dell onboard S140 RAID...
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Asterisk – Basic (Extension, SIP phone, Voicemail)
October 17, 2019
There are multiple types of extension in Asterisk, which are using different ports to register. The most popular one is PJSIP (UDP5060) which is default by most of the sip phones, on iPhone, the Softphone, Xlite. The option you need to configure are: Extension number: which is used as the UserName Secret: which is used...
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VoIP
October 17, 2019
VoIP ...
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Deploy APP from Profile manager
October 16, 2019
Prerequisite Install of MACOS Server, which can be downloaded from APPStore, registration of Volume Purchase Program account Deploy App We would need to first purchase the App from Volume Purchase Program. vpp.itunes.apple.com Choose Either education or Business according to your situation, I will choose Education as an example: Purchase/install APP Go to Apple...
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Apple device profile manage
October 16, 2019
You might be happy to note that other than the ability to interpret new payloads, the profiles command mostly stays the same in High Sierra. You can still export profiles from Apple Configurator or Profile Manager (or some of the 3rd party MDM tools). You can then install profiles by just opening them and installing....
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Multiple PHP version for apache on CentOS 7
October 15, 2019
I will take PHP 5.4 and PHP 7.2 as example: $ sudo yum install epel-release Turn remi repo too: $ sudo yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm Install yum-utils packages too: $ sudo yum install yum-utils Enable remi repo, run: $ sudo yum-config-manager --enable remi-php72 $ sudo yum update Search for PHP 7.2 packages and modules with more...
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CSS basic
October 14, 2019
Decorate Phone number: The Smart phone will detect the phone number and render it, which may make the style inconsistent. To To remove all auto-formatting for telephone numbers, add this to the head of your html document: <meta name="format-detection" content="telephone=no"> View more Apple-Specific Meta Tag Keys. Html: Note: If you have phone numbers on the...
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DHCP OPTION 43 Configuration Example
October 14, 2019
TLV values for the Option 43 sub-option: Type + Length + Value. Type is always the suboption code 0xf1. Length is the number of controller management IP addresses times 4 in hex. Value is the IP address of the controller listed sequentially in hex. Convert IP address to Hex: Open the windows calculator and go...
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Storm Control (Traffic suppression)
October 9, 2019
Storm control prevents traffic on a LAN from being disrupted by a broadcast, multicast, or unicast storm on one of the physical interfaces. A LAN storm occurs when packets flood the LAN, creating excessive traffic and degrading network performance. Errors in the protocol-stack implementation, mistakes in network configurations, or users issuing a denial-of-service attack can cause a...
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Scheduling an action on User switching
September 19, 2019
The system logon/out, startup/shutdown script are already built in by Microsoft, and you can give them privilege via group policy setting. Today I will introduce a solution to schedule an action upon user switching, which is not an login/out action. This scenario is typically useful for a proxy session monitoring, which usually require system to...
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Integrate CME with CUE/CUC configuration example
September 17, 2019
Topology CME: 192.168.5.254/24 CUE: 192.168.5.5/24 Gateway: 192.168.5.2 Voicemail number: 3999 MWI on: 8000 MWI off: 8001 Reception number: 1002 CME configuration CME is sitting in 192.168.5.0/24 network, with ip 192.168.5.254. Router(config)#telephony-service Enter the command max-ephones max-num-phones in order to set the maximum number of IP phones to be supported by this platform. Router(config-telephony)#max-ephones 144 Enter the command max-dn max-directory-numbers in order to set...
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SIP trunk registration
September 17, 2019
Sip registration proxy End-to-End Mode In the end-to-end mode, Cisco UBE collects the registrar details from the Uniform Resource Identifier (URI) and passes the registration messages to the registrar. The registration information contains the expiry time for rate-limiting, the challenge information from the registrar, and the challenge response from the user. Cisco UBE also...
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