difference between gateways, voice and Porter
Someone might well want explain (or provide a url link) the main difference between the voice gateways and a guard?
Your best source of information is the book of Cisco Press 'Cisco Voice Gateways and guardians (GWGK)' which explains these 2 more in detail. I have included information to help...
The role of voice gateways:
In a VoIP environment, voice gateways are the interface between a VoIP network and the public switched telephone network (PSTN), a private branch exchange (PBX) or analog devices such as fax machines. In its form the simplest, a voice gateway has an IP interface and a legacy phone interface, and it manages the many tasks involved in translation between protocols and transmission formats.
At least one gateway is an essential element of any IP telephony system that interacts with the PSTN or analogue devices. In addition, when the front doors are configured correctly, many can resume when it is inaccessible to a Cisco CallManager.
The gateway that enables communication between the two networks by performing tasks such as these:
Interfacing with the PBX and the PSTN or IP network.
Support IP call control protocols, more than time-division multiplexing (TDM) call control protocols.
For calls between VoIP and PSTN closing networks and REPETITION of the call media and noting the call setup and teardown artist.
Providing additional services, like call hold and transfer.
Relay of DTMF multi-frequency (DTMF) tones.
Supporting modems and analog fax via the IP network.
In a Cisco CallManager network, a gateway must also do the following:
-Support the CallManager redundancy in replacement of spare CallManager.
-Support survival call when no CallManager is available.
Gateways communicate with other gateways, guards, their end points or their control agents, such as Cisco CallManager call or a PBX.
Protocols that use Cisco gateways for voice signaling and media are:
Media Gateway Control Protocol (MGCP)
Session Initiation Protocol (SIP)
Skinny Client Control Protocol (SCCP)
Real-time Transport Protocol (RTP)
The role of guardians of the voice:
Access controllers help scale of large VoIP networks. Businesses that are geographically dispersed, networks of voice, or that have become so important that they are difficult to handle, could opt to segment their network. In a network of CallManager, you can create multiple clusters. In this case, you need to configure a full mesh of connections via the WAN IP to connect all segments or clusters. You need to configure the dialing information for each remote location on each bridge and CallManager cluster.
It is preferable to use the guards. In a network that has doormen, trunks are necessary only for the keeper and the goalkeeper keeps information of remote endpoint.
When you use access controllers, gateways and CallManager to register with their goalie. Doormen divide the network into 'zones', or groups of devices that fit to a particular access controller.
When an H.323 gateway receives a call that is intended for a remote phone, he asks the guard for the location of the endpoint.
If the call is for a different area, you can configure the guardian to allow it only if sufficient bandwidth is available. In more complex networks, you can use a directory gatekeeper to maintain information on all areas.
You can configure routers Cisco with the Cisco IOS appropriate as guardians H.323.
Please note the useful messages...
Tags: Cisco Support
What is the difference between the two models, Portege R700 and Satellite R630?
Is it only fingerprint, port dock station reader and a more powerful configuration (CPU, SSD, WiFi 802.11n, Type)?
Is this the same materials used body? Is it the same weight?
I found this comparison:
There are many differences between these models and also, there are different R700 and R630 models on the market.
In my opinion, you should check these notebooks from Toshiba Web site. There you can see what models are currently available and the configuration.
Satellite R630 page:
Portege R700 page:
I am confused between Unicast RPF and Reverse Path Forwarding function.
What is the difference between Unicast RPF and Reverse Path Forwarding?
Because they have all two please check the address of the source of each package before sending it to the destination too?
Reverse Path Forwarding is used only when the network want to build a tree shared multicast communication and then we must use Unicast RPF after creation of the shared tree?
The mechanism of the RPF is mainly used to ensure no loop of routing traffic.
As you probably already read, it does by ensuring that his route to the source address of a packet received is accessible via the same interface that the packet is entered in the. Think of the notion of "root port" in STP. all root ports are similar to the root, sunflower follow the Sun. Therefore, it is naturally a loop prevention mechanism.
With multicast traffic, it is quite likely to create multiple loops of routing the nature of 'destination' traffic. For this reason, using a mechanism as the RPF to ensure you are on the "road to the root" (to say) to the source originating multicast traffic. Otherwise if you're not then you either receive this traffic route in a loop, or a suboptimal path.
uRPF works essentially the same way, except that it is done for unicast traffic instead. Now with unicast traffic your flow is from a source and directs to a single destination. Given that, as the fact that you are using a dynamic routing algorithm (which allows to select the path to a destination), you can have loops of your network for unicast traffic flow routing; of course there may be exceptions to pitfalls of configuration route redistribution.
However RPF when it is applied to traffic unicast can add another advantage, and it's verification IP source. That's why we can use it as a security mechanism to ensure that data are from where it is supposed to come.
On the limit of the L2, you then have mechanisms such as guard source IP to ensure that the correct host is not usurpation of their IP address.
By analogy RPF can be used for checking at source for multicast traffic, and it is intrinsically that however, the most important role is so that it can be used to guarantee without loop routing of multicast traffic.
I hope that helped clear things upwards and not confused you any more with all this.
What is the technical difference between a message and a conversation. Is that when multiple messages are in 1 conversation?
An email received or sent is a message.
A conversation can be launched with a message.
A conversaion can have messages, screw where the example: the 'Reply' button was used and enamel is spent here and there with the comments.
If you select multiple messages in a list, they will be displayed below in the Message pane in the form xx number of conversatons.
If you right-click on a message in the list and choose "open in a conversation." then it will open in a new tab showing all the emails included threaded, which are relevant to that conversation, both received emails and those you sent.
I get all the IDs and passwords and none are accepted
"I received message' iPad requires your password after restart", but it does not accept passwords
What is the difference between the password and access code
Standard codes which block the iPad are 4 or 6-digit. You can set a more difficult to decode, personalized access code / password in the settings using letter and numbers if you wish.
A password is a series of numbers, symbols and letters that a user putting in place to protect the information in a frame, a web site, e-mail, etc. This may actually be a word or series of words, if you wanted to set up in this way.
Your iPad is looking for this 4- or 6-digit code. If you can remember, you must restore the device so for free.
I searched your laptop and I was amazed by the Qosmio.
When I was going to order it, I noticed that there are many models of the G20 with different specifications. Also, I found G25 on internet research and found no difference between the G25 and G20 except receiver TV G25 is NTSC and G20 was released on March and G25 was in June. Instead, they have the same specifications for the hard drive.
I live in the Portugal and the model Qosmio I can find that this is the G20-118. I was looking for the model that has 2 x 100 GB SATA HD, but cannot not thought about it.
Internet research I found Qosmio G20-111 which has 2 x 100 GB SATA HD, but on the web page mentioned that it was a Pentium III processor (ridiculous, isn't?). I was looking for more reliable information.
Already searched for toshiba pages and found no specifications for all models I found 490LS on the research on the web as the G20 - 102, 105, 106, 108, 109, 111, 118, 123,...
Can someone help me with this? Are there any reliable web page where I can see the differences between the models? is there a .pdf or anyone who can please give me some advice?
Money is not a problem at this time to acquire the laptop, I'm looking for only the laptop performance more!
It of very difficult to say what camera is best, because there are many models with different parts.
However, I found page with description of the G20 and G25.
Take a look at this link.
What is the difference between the iwatch and Apple Watch? In the sales pitch pre for the iwatch, the price was given to about $17,000, while the Apple Watch sells in the $350-500 range. What gives?
There is no such thing as a iWatch.
There are three versions of the Apple Watch.
Apple Watch Sport
Apple Watch Edition
We bought a few jack live, Mfr P/N 187949-10, but the parts are labeled 187949-01. What is the difference between-10 and -01. Are parts of the same, but differ only in the amount of packaging? Thank you.
Thanks for the post and I hope that your well today - welcome to the Forums of NOR.
I'm sorry to see that you have not yet received any support.
Looking at the site, ni.com, here, I found this information,
Specifications and manufacturers for Council mating of connectors
(1) 4 piece Kit of screws for connection cables 187949-01 locking screw
(10) 4 piece Kit of screws for connection cables 187949-10 locking screw
That is why the differences between the 01 and 10 is the number of kits.
However the link here.
Specifications and Dimensions of the female connectors to screws used on 68 pins plug-in connectors
"The kit contains 40 screws and washers (enough to convert the two ends of the).
10 sets of cables). The part number of the kit is 187949-01 "
But I guess that goes back to were you waiting for 1 or 10 sets?
I hope this helps.
What is the difference between the scores and correlation in geometric correspondence?
the correlation score is based on pixel intensities while the score of the geometric game also considers the characteristics of the geometry. See the Concepts of Vision or (geometric matching-> discussion).
I hope this helps.
I'm using Labview 7 and in my mahcine I have an installed 6013 card. However, there was an interface card designed by someone else long ago, on the table, only AO0, AO1,..., A07, DIO0, DIO1,..., DIO7 were printed. In the program, I saw some code to write to digital Line.vi allows you to send data to the digial io. Say that I write for DIO 3, so I understand here DIO 3 means the channel of e/s 3, but online? What is the difference between the channel and the line? When I write the data to a single channel of e/s, are us wriitng a byte or a bit of it? Thank you.
A channel is usually used with inputs/outputs analog. Each AI or AO is a string.
I just bought the student of LabVIEW 8.5.1 version and I use Mac OS X 10.4.11. What are the biggest differences between the Mac and Windows versions, since the box came with a CD of installation of Mac and a Windows DVD Installer?
See you soon
Looks like you got the LabVIEW Student Edition Software Suite DVD.
It comes with 6 boxes to tools, and the TME product, some (or all?) of those who are windows only (at least 8.5), for example:
- Toolkit Digital Filter Design
- Modulation Toolkit
Since you have 8.5, you are missing also a few basic things that only recevied at the 8.6MAC support, like Mathscript, Control design and Simulation and native 3D graphics.
Pls explain me what is the difference between the groups and the organization unit in simple terms with an example in real time.
See you soon.
What are the differences between the services and site domain group policy and group policy?
Server must wonder about the Technet site. http://social.technet.Microsoft.com/forums/en-us/home
There are the functional differences between the trial and the paid version for Labview 2009? Thank you.
He described the Labview eval version limitations: Limitations of the Evaluation Version of LabVIEW
See you soon,.
Which is better and why?
Feel like machines are much bettr built and care generally superior to her ===> higher prices. A lot of people asking the same question such as:
they are also designed to compete with other lines to other providers. Please read more information:
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