ISDN30

ISDN30 is a type of Integrated Service Digital Network system that is used for the transmission of voice and data over wires. ISDN 30 is one of the most economical and efficient communication systems. It is used in medium as well as large businesses. Through ISDN 30, business organizations and call centers can get high speed Internet connections at very economical rates.

ISDN 30 connections can be obtained from the local telephone exchange. The speed that it provides may vary; the maximum is 2mbps (E1 circuit). ISDN 30 consists of two channels: one channel is used for synchronization and maintenance, while the other is used for service signals. Using suitable ISDN (Integrated Service Digital Network) equipment, both voice and data can be sent both locally and internationally.

Features of ISDN 30

There are several key features of ISDN 30 that explain the reason for the popularity of this communication system:

• Digital Lines: ISDN 30 is most suitable for high-speed data transfer, voice transmission, etc. That’s why it is very useful for call centers.
• Digital Path: This feature allows voice, data and text transmission.
• Calling Line Identification: This feature identifies the lines before answering.
• Digital Private Network Signaling System Interworking (DPNSS): This feature allows users to interconnect with private networks.
• Direct Dialing in (DDI): Offers economical and direct phone accessibility to PABX users.
• Network Provided Diversion: This feature allows you to transfer calls automatically to any alternative point.
• Public dialed service: This feature allows you to pay as per use. You can use high-speed connection at affordable rates.
• Channels: ISDN 30 delivers eight 64kbps Channels and depending upon your requirement, it can be increased further.

ISDN 30 is more suitable for medium and large businesses. The ISDN 30 is an intelligent choice for those looking for cost-effective communication systems for their businesses.

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GNS3 unable to simulate PPP Multilink?

i’m not sure why IOS 12.4 has missed out ‘multilink’ under the serial interface option.. i tried on 3640, 3670 even 7200 series but still unable to simulate the multilink config.. i’m able to go to multilink interface, assign an IP, set encapsulation as ppp.. but subsequently unable to tag and assign serial int to group itself..  : / idk i might skip that portion and revisit later..

Multilink PPP (also referred to as MP, MPPP, MLP, or Multilink) provides a method for spreading traffic across multiple physical WAN links while providing packet fragmentation and reassembly, proper sequencing, multivendor interoperability, and load balancing on inbound and outbound traffic.

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the conscious choice

這周與上周比，從忙的角度來看的話，有點增加了點兒。老闆目前叫我做的就有幾個啦，數據中心轉移(LGI)，分行更新(BT)，GELS辦公室裝修，SFTP連接(SGX), 安裝新伺服 (SUSE), 明日星期天就有F5 POC, 要早起啊 -__-a

做多點，快點，不怨天，不尤人，這一切是由我來決定，選擇了這條凹凸不平的路是為了考驗我自己，為了自己前途著想。雖然有時想換職，但還好老闆讓我換組，就得留下嘗試下新環境。新環境如何，看來比之前還要更加複雜。許多東西都要實踐出才能真正體驗到內涵。

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a sleeping cat

每天我經過的那段小道旁的一張椅子，肯定會有一只小貓在那睡覺，那可愛的臉頰讓我心安寧下來。我今天來不及把它拍下但下次我會拍給大家看有多麼可愛。雖然我自己本身不想養貓，狗，或者任何動物，為何？反正都麻煩，管自己都已經快要不行了還要管只小貓？哈哈。。

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AsteriskNOW & FreePBX..

I’m quite surprised to find out that Asterisk chose CentOS as an underlying OS. i thought it was derived from FreeBSD.. perhaps they don’t consider it as an network appliance hmm..

btw i’ve installed it on my VM and i’m using FreePBX as a default and complete web based config and management for Asterisk. it’s quite famous and modular afaik.. well.. perhaps i’ll try it out this weekend..

btw i find below argument between opensource vs commercial software very true and well written…

“I’ve deployed quite a few Cisco based VoIP systems for small to large sized companies. I’ve also used Asterisk. There is no arguing with the fact that Asterisk is free. The debate will go on for years about the actual cost, or TCO of commercial -vs- open source, so I will spare everyone that.”

“What it really comes down to is risk. There is an old saying in IT, that “No one ever got fired for buying IBM”. In general (read 99.99% of the time), that is a true statement. Today you can say the same thing about Cisco.”

“When you suggest to management that you can produce a system with open source software that will have an over-all cost reduction of (insert your best guess at savings here), you are setting youself up to be either a hero, or a patsy, depending on how well everything goes. If you save the company $200,000.00 on their new phone system by sucessfully installing Asterisk, you will likely get a big pat on the back and perhaps, if you are VERY lucky even an extra grand or two in your bonus. If you suggest installing Asterisk to save money, and after several months the company’s phone system is still dropping customer calls, or failing to route calls correctly, well you better have your resume up-to-date, cause the CEO is going to want someone’s head. If your Cisco VoIP deployment goes all to hell, and you’ve kept Cisco involved when there are problems, then your butt is covered at least.”

great info pertaining to GUIs for Asterisk based PBX: http://www.voip-info.org/wiki/view/Asterisk+GUI

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Configuring Cisco CME Express Part 2

Once the startup has been setup, next is to configure ephone registration, defining ephones, maximum extension number supported (max-dn), maximum phones supported (max-ephone), ip source address (interface listening to IP Phone, either loopback or physical int), the ‘button’ command (lots of functions, normal ring, call waiting, feature ring, monitor mode overlay mode, etc), shared lines (preference, huntstop).

CME_Voice(config-telephony)#max-dn 10
CME_Voice(config-telephony)#max-ephones 10
CME_Voice(config-telephony)#ip source-address 10.100.100.1
CME_Voice(config)#tftp-server flash:phone/7940-7960/P00308000500.bin alias P00308000500
CME_Voice#sh ephone
ephone-1 Mac:0200.4C4F.4F50 TCP socket:[1] activeLine:0 REGISTERED in SCCP ver 15 and Server in ver 8
mediaActive:0 offhook:0 ringing:0 reset:0 reset_sent:0 paging 0 debug:0 caps:10
IP:10.100.100.12 1318 CIPC   keepalive 17 max_line 8
CME_Voice(config)#ephone-dn 1 dual-line
CME_Voice(config-ephone-dn)#number 1001 secondary 68761001
CME_Voice(config-ephone-dn)#end
CME_Voice#
CME_Voice#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
CME_Voice(config)#ephone 1
CME_Voice(config-ephone)#mac-address 0200.4C4F.4F50
CME_Voice(config-ephone)#button 1:1
CME_Voice(config-ephone)#restart
Mar  1 00:15:27.292: %IPPHONE-6-UNREGISTER_NORMAL: ephone-1:SEP02004C4F4F50 IP:10.100.100.12 Socket:1 DeviceType:Phone has unregistered normally.
Mar  1 00:15:27.896: %IPPHONE-6-REG_ALARM: 23: Name=SEP02004C4F4F50 Load= 7.0.2.0 Last=Reset-Restart
Mar  1 00:15:27.904: %IPPHONE-6-REGISTER: ephone-1:SEP02004C4F4F50 IP:10.100.100.12 Socket:1 DeviceType:Phone has registered.

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悟 – 新少林寺主題曲

我剛下了劉德華《新少林寺》主題曲, 名為《悟》, 非常好聽.. 歌詞裡面彙集了劉德華從藝三十年來的人生感悟。在經歷了人生的起起伏伏後,劉德華表示自己現在已經學懂放下“貪嗔癡”,只想“簡簡單單”的過好眼下的每一天…. 貪,是對於喜好的過分偏執; 嗔,是對於討厭的過分偏執; 癡,是根本的不明事理的實相而做出貪或者嗔的反應。 戒定慧是對治貪嗔癡的方法..

劉德華 – 悟

無量心生福報無極限 | 無極限生息息愛相連 | 為何君視而不見 | 規矩定方圓 | 悟性悟覺悟空心甘情願

放下顛倒夢想放下雲煙 | 放下空欲色放下懸念 | 多一物卻添了太多危險 | 少一物貪嗔癡會少一點

若是緣再苦味也是甜 | 若無緣藏愛在心田 | 塵世藕斷還絲連回首一瞬間 | 種顆善因陪你走好每一天

唯有心無掛礙成就大願 |  唯有心無故妙不可言 | 算天算地算盡了從前 | 算不出生死會在哪一天

勿生恨點化虛空的眼 | 勿生怨歡喜不遙遠| 纏繞欲望的思念善惡一瞬間 | 心懷懺悔陪你走好每一天

再牢的謊言卻逃不過天眼 | 明日之前心流離更遠 | 浮雲霎那間障眼人心漸離間 | 集苦連連不斷的出現

無量心生福報無極限 | 無極限生息息愛相連 | 凡人卻視而不見規矩定方圓 | 悟性悟覺悟空心甘情願 | 簡簡單單陪你走好每一天

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