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: [email protected] [mailto:[email protected]] On Behalf Of Hardesty, Scott Sent: Wednesday, December 24, 2008 8:24 AM To: jeremy co; [email protected] Cc: [email protected] 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 | [email protected] D: 301.313.2041 | C: 443.789.1219 | www.presidio.com <http://www.presidio.com/> <http://www.presidio.com/images/presidio_logo.gif> _____ From: [email protected] [mailto:[email protected]] On Behalf Of jeremy co Sent: Wednesday, December 24, 2008 1:51 AM To: [email protected] Cc: [email protected] 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, <[email protected]> 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 <[email protected]> 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 <http://pr.mail.yahoo.co.jp/toolbar/> the Internet with Yahoo! Toolbar.
