James, My understanding of what scott said is B channels would not successfully busy out from perspective of pstn. But I think when u define pri-group timeslot 1-3 , router will not stablish L2 with pstn, as I tested this be4. So I think it does not depend and for IOS using this option is not required.
Tha's y understanding. Correct me if I'm wrong. Jeremy On Thu, Dec 25, 2008 at 3:00 PM, James Key <j...@jackhenry.com> wrote: > > Jeremy, > As Scott stated below, it depends. It depends on the requirements given to > you. I wouldn't assume that it is ok never to use B-channel maint on an IOS > gateway. Myself, I have always made it a habit to configure it. You are > most likely going to be in service parameters anyways at some point, doesn't > take long to configure it. > > James > > > -----Original Message----- > From: ccie_voice-boun...@onlinestudylist.com on behalf of jeremy co > Sent: Wed 12/24/2008 7:55 PM > To: Michael Thompson > Cc: ccie_voice@onlinestudylist.com; saralilin2...@yahoo.co.jp > Subject: Re: [OSL | CCIE_Voice] using Change B-Channel Maintenance > forIOST1or not? > > Thanks guys, > > > Thanks guys > > Now it is clear and safe to not use this option for ios mgcp gateway :) > > > > Cheers > > Jeremy > > On Thu, Dec 25, 2008 at 12:31 AM, Michael Thompson > <mthompson...@gmail.com>wrote: > > > Guys, to clarify a couple of things. > > > > > > > > B-Channel Maintenance CAN be used for any MGCP gateway. > > > > > > > > For purposes of the lab, you only NEED to use it for the 6608 blade, and > > why is that?? The 6608 blade does not give you a configuration option > that > > could allow a fractional PRI. An IOS MGCP gateway will allow you to > > configure a fractional T-1/PRI with the timeslot option. The exception > to > > that is if you use the ccm-manager config option for MGCP (which screws > you > > up for the lab). If you use the ccm-manager config option, it assumes > only > > a full PRI.it won't let you config a fractional. > > > > > > > > Hope that helps clarify. > > > > > > ------------------------------ > > > > *From:* ccie_voice-boun...@onlinestudylist.com [mailto: > > ccie_voice-boun...@onlinestudylist.com] *On Behalf Of *Hardesty, Scott > > *Sent:* Wednesday, December 24, 2008 8:24 AM > > *To:* jeremy co; saralilin2...@yahoo.co.jp > > > > *Cc:* ccie_voice@onlinestudylist.com > > *Subject:* Re: [OSL | CCIE_Voice] using Change B-Channel Maintenance for > > IOST1or not? > > > > > > > > > > > > You use the B-channel maintenance for all MGCP gateways (IOS and 6608 > > module). For the lab, outbound calls should work without b-channel > > maintenance if you are using the top-down since the gateway will select > the > > 1st channel and hunt sequentially down for additional channels. How is > > the PSTN sending the calls inbound? If the PSTN is sending calls inbound > > starting at the 23rd channel (bottom up) then the call will likely fail > > because the 23rd channel is showing available but I is not on the MGCP > > side. > > > > > > > > So the always correct engineering answer still applies. "IT DEPENDS!" > > > > > > > > Scott. > > > > > > > > > > > > *Scott Hardesty | Cisco Engineer | MidAtlantic | Presidio Networked > > Solutions* > > > > *7601 Ora Glen Drive, Suite 100**, Greenbelt, MD 20770** | > > sharde...@presidio.com* > > > > *D: 301.313.2041 | C: 443.789.1219 | www.presidio.com* > > > > > > > > ------------------------------ > > > > *From:* ccie_voice-boun...@onlinestudylist.com [mailto: > > ccie_voice-boun...@onlinestudylist.com] *On Behalf Of *jeremy co > > *Sent:* Wednesday, December 24, 2008 1:51 AM > > *To:* saralilin2...@yahoo.co.jp > > *Cc:* ccie_voice@onlinestudylist.com > > *Subject:* Re: [OSL | CCIE_Voice] using Change B-Channel Maintenance for > > IOST1 or not? > > > > > > > > I think we use this option to busy out unused channels since we use > > fractional T1 not full one. > > > > But my doubt is to use it on IOS mgcp GW or not? > > > > > > > > Jeremy > > > > On Wed, Dec 24, 2008 at 5:36 PM, <saralilin2...@yahoo.co.jp> wrote: > > > > > > we only need to do b-channel maintenance if question ask for bottom up > > right? if we choose top down this is not needed, am i right? > > > > Sara > > > > > > > > *jeremy co <jeremy.coo...@gmail.com>* wrote: > > > > > > > > Hi, > > > > I've seen some workbooks use Change B-Channel Maintenance option to > busyout > > unused channels on T1 of IOS GWs as well as 6500 T1 while some of them > only > > use this option on 6500 T1. > > > > In cisco Docs, I can it specified to use thi option for "MGCP gateways" > > > > > > So which method should be used? > > > > btw, I use both and both works for IOS . > > > > > > Jeremy > > > > > > ------------------------------ > > > > Power up the Internet with Yahoo! Toolbar.< > http://pr.mail.yahoo.co.jp/toolbar/> > > > > > > > > NOTICE: This electronic mail message and any files transmitted with it are > intended > exclusively for the individual or entity to which it is addressed. The > message, > together with any attachment, may contain confidential and/or privileged > information. > Any unauthorized review, use, printing, saving, copying, disclosure or > distribution > is strictly prohibited. If you have received this message in error, please > immediately advise the sender by reply email and delete all copies. > >
