mbruno
join:2003-07-03
Fruitland, MD | [Info] VOIP - Cisco Call manager Question I was wondering if anybody in here has their Cisco Voice cert. I have a question and was wondering if someone could help me out. So after I pass my ICND2 test hopefully by the begin of Feb. I want to start looking a VOIP. My question is this, when you setup call manager or unified communications or whatever the name is now. Can you route everything through your broadband provider or do you have to get dedicated line like a phone line and pipe it through there.
I am a little confused about that part, it my understanding that you can pipe everything through the broadband provider which is what makes this a good solution for businesses. What I am not understanding for example is when you go out and buy a service like Vonage, they give you a ATA box and you plug one side into the phone and the other side into your broadband and place your calls.
I am guessing on Vonage's side they are somehow tied to the phone company. Is this by T1 lines or do they have copper wire pairs coming in to their facilities and passing the calls off like that. I find VOIP very interesting and see this technology only growing as the years pass. If you look at some of your big box stores you can see that they are already using it. |
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bclbob
join:2000-06-23
Oak Park, IL | I'm no Cisco Voice Cert, but on Cisco IOS voice images, SIP connectivity is included. I don't think you can use it to Vonage however, as they don't allow "Bring Your Own Device".
I'm using voip.ms and it works great on a Cisco 3745 router. The service is SIP over broadband. I have no traditional voice lines. Hope this helps. |
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mbruno
join:2003-07-03
Fruitland, MD | said by bclbob: I don't think you can use it to Vonage however, as they don't allow "Bring Your Own Device". It does a little. When I was saying vonage, I didn't want to use Vonage. I was only using Vonage as a example of VOIP. I am sure it goes deeper then that on CCME. I will have to check out voip.ms, I have also heard of people using a piece of software called asterisk as their sip gateway. To my understanding, the coders have been able to reverse engineer code to allow this open source software to interact with some of the Cisco equipment.
When businesses get VOIP installed in their buildings, what do they use for a provider? |
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bclbob
join:2000-06-23
Oak Park, IL | My employer uses Level3.
»www.level3.com/en/products-and-s···runking/ |
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mbruno
join:2003-07-03
Fruitland, MD | reply to bclbob
said by bclbob:I'm using voip.ms and it works great on a Cisco 3745 router. The service is SIP over broadband. I have no traditional voice lines. Hope this helps.
Thanks for the heads up on voip.ms service. I just signed up with them for my iphone. This is kind of what I have been looking for, this is great! I knew something like this existed but didn't know where to look. When I get started on my Cisco Voice stuff, I will use them for my home lab setup. |
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| reply to mbruno
The businesses profit from the FAT pipes... That means, you'd use the FAT pipe to send data, video, and voice so you won't need to set up multiple PBXs between locations... Although that helps for local calls...
So, if you set up an organization that had offices all over the states it would be cheaper to route traffic internally and dial locally to a phone number you are trying to dial. The same goes for international fone calls. If you had offices in Australia, it's best to reroute the calls thru the Data trunk on the FAT pipe and dial out of Australia for lower cost phone calls....
There are downsides as sometimes if this traffic traverses thru internet calls may not be very nice... but these days all ISPs QoS their traffic. |
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cramer
join:2007-04-10
Raleigh, NC
kudos:5 Reviews:
 ·AT&T Southeast
| reply to mbruno
There's no "reverse engineering" required. SIP is a well documented, open standard. (as are H.323 and MGCP. Skinny is the only protocol not well documented... designed by Celsius, bought by Cisco.)
Businesses have a long (and growing) list of companies who provide VoIP trunk services. Most of the big names in telco service offer VoIP now. However, many businesses still prefer traditional phone technology into their own IP-PBX -- that is PRI into Asterisk, Cisco UC/CME, etc. (data lines to other sites then can carry internal phone traffic as well.) |
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mbruno
join:2003-07-03
Fruitland, MD | said by cramer:There's no "reverse engineering" required. SIP is a well documented, open standard. (as are H.323 and MGCP. Skinny is the only protocol not well documented... designed by Celsius, bought by Cisco.)
Businesses have a long (and growing) list of companies who provide VoIP trunk services. Most of the big names in telco service offer VoIP now. However, many businesses still prefer traditional phone technology into their own IP-PBX -- that is PRI into Asterisk, Cisco UC/CME, etc. (data lines to other sites then can carry internal phone traffic as well.)
Actually not to pick a fight or anything, but the "reverse engineering" term came from one of their own (Asterik) people who sings praises about the open source software. This is not my term, I am just repeating what I heard from an interview by them. And before anybody say anything, no I don't always believe what I hear. That being said, I am just trying to learn as much as possible about VOIP and what commercial companies use. I find the idea of VOIP very interesting from a business stand point and as well as a hobbyists view point. |
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| reply to mbruno
Setting up Voip does not necessarily mean getting a VOIP provider. VOIP is simply routing voice over a data circuit. In the below examples VOIP leg occurs between points (A) and (B). The voip legs will either be H323 or SIP
pstn------HQ(A)----------WAN-------(B)Remote------pstn
Home phone ------Router/ATA(a)-------------(B)SIP Provider-----pstn
International calling Cards-----pstn-----Calling Card Router(a)-------WAN-----(B)Calling card Router----pstn |
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