[cisco-voip] Moving to SIP

[Dennis Heim]

There are DR aspects that are handled better by going SIP.  Usually you might have 2 head-end sites that split the load and fail-over. More importantly you avoid the telco restrictions with porting number between LATA's. Enterprise SIP (Verizon, Att, XO, etc) usually does not route across the internet. Enterprise grade SIP is different than per se vonage. In large installation it makes sense to be running G.729. If you have remote sites you will probably be running G.729 to most of your locations. By going g.729 sip, you eliminate the need for transcoding to the pstn for your remote sites if you are using centralized trunks, SIP is not a 100% replacement for PRI's for all situations. There are places in the this world that you still cannot get a PRI, so that is another situation where SIP would be appropriate.

Dennis Heim
Network Voice Engineer
CDW  Advanced Technology Services
10610 9th Place
Bellevue, WA 98004

317.569.4255 Single Number Reach
317.569.4201 Fax
dennis.heim at cdw.com<mailto:dennis.heim at cdw.com>
cdw.com/content/solutions/unified-communications/<http://www.cdw.com/content/solutions/unified-communications/>

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of SouthEastTexasTelecom
Sent: Sunday, September 25, 2011 1:48 PM
To: 'cisco-voip'
Subject: Re: [cisco-voip] Moving to SIP

Personally I cant see the need to change from ISDN PRI to SIP anyway.. I DON'T see the cost savings I would rather had a PRI into a switch for LOCAL calls/911!!!  and use SIP for on-net and LD calls....(and have the ISDN PRI for backup!! I JUST DON'T like putting it all in one basket...cut the internet cord and you are SOL....WHY do people do this??).

One small company locally had a Nortel KSU system with 3 analog trunks.....they changed to a NEC VoIP system...but KEPT the analog trunks!!! DUH!!! WHAT A WASTE OF MONEY!!! They get NOTHING they didn't have with the Nortel (unless they didn't have the CLID cards in the Nortel...BIG deal...that's only $150 for the card...) They had CallPilot VM which does everything Cisco's does....Someone mind explaining this to me???? I took Economics 101 in College (but I FLUNKED that course......who the hell can learn with one bloodshot eye at 7AM!???!!! Kudos to Lewis Black for that JOKE)

I am sorry but VoIP IS NOT the way to go for EVERYTHING....

I HAVE added Vonage lines to Nortel KSUs with CallPilot that gave them unified messaging and free LD....funny, the cost was MUCH LOWER than a new Cisco system and they have ALL the features....SO someone tell me...WHY???????????????????? I JUST DON'T get it....(oh you can plug the phone into the network?? AHHH yeah after you put PoE routers in...there's capital.....and then you change the phones out...more capital....AHHHH AM I MISSING SOMETHING HERE???? NO!!)

YOU DON'T SAVE A DIME GOING TO CISCO VOIP from a TDM box for small/medium offices...MAYBE enterprise....MAYBE...but I doubt the ROI is worth it...

And we wonder why America businesses is sucking, especially in the tech area as a former leader...DUH!!!!

Chris
Owner, SouthEast Texas Telecom
(and buying another telecom company for $2million to add to my customer base; I've been on the rodeo for 36+ years)

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill Simon
Sent: Sunday, September 25, 2011 1:22 PM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Moving to SIP

Someone please explain why the codec needs to change from G.711u to G.729 simply because of a transition from PRI to SIP?

Does AT&T's SIP service not support G.711? Or are you simply trying to squeeze more channels onto limited bandwidth? (Get more bandwidth.)


On 9/24/11 12:38 PM, Jason Aarons (AM) wrote:
The larger you are the more advantages.  For small business I agree sticking with PRI since you can get them dirt cheap.  For example bank with 700 branches can see a 14 month ROI versus fractional PRIs across all those sites, more mpls bandwidth to branch for video/digital signage, fewer hardware costs, etc.


From: Lelio Fulgenzi [mailto:lelio at uoguelph.ca]
Sent: Saturday, September 24, 2011 11:53 AM
To: Jason Aarons (AM)
Cc: Haas, Neal; cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] Moving to SIP

Anyone else have the feeling SIP isn't all it's cracked up to be? In our case, if you're not already getting Internet service from your your SIP provider, it's just not that economical. Especially if you have to keep a PRI around for faxing, modems, alarms, etc.

Sent from my iPhone

On Sep 24, 2011, at 10:51 AM, "Jason Aarons (AM)" <jason.aarons at dimensiondata.com<mailto:jason.aarons at dimensiondata.com>> wrote:
Yes faxing/modem/postage won't work. Look into separate device pools for g711 stuff, etc.


From: cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> [mailto:cisco-voip-bounces at puck.nether.net]<mailto:[mailto:cisco-voip-bounces at puck.nether.net]> On Behalf Of Haas, Neal
Sent: Friday, September 23, 2011 6:27 PM
To: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: [cisco-voip] Moving to SIP


We are moving to (ATT) SIP from standard PRI's, of course we just realized that our unity is G711.

Are there any gotchas by just changing the General Configuration to G729a?


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