Thanks for the great info Paul. 1. Is the Call Manager a DSN compliant switch? 2. Do you have to order a separate DSN compliant trunk from the Telco?
John Kaberna CCIE #7146 NETCG Inc. www.netcginc.com (415) 750-3800 Instructor for CCBootcamp 5-day class www.ccbootcamp.com __________________ CCIE Security Training www.netcginc.com/training.htm ""Paul Werner"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > DSN is not exactly what I would refer to as tapping into the > local telco. DSN (Defense Switched Network) replaced AUTOVON > (Automatic Voice network in the mid to late 1980s and through > the early 90s). AUTOVON was set up to principally be a voice > only network, and in many case over analog switch facilities. > DSN converted it over to all diigital, and included voice, > video, and data over the same trunks. > > The key difference between DSN and a regular commercial call is > they go over different trunks and they terminate at DSN > compliant switches. There are several things different about > DSN compliant switches, but the key difference is the use of > precedence, and precedence codes. They have no real > counterpart in a commercial trunk, other than an operator > interrupt for an emergency. With DSN, the end user can preempt > a trunk and knock another user off the line with the proper > precedence level. Some folks out there who know their RFCs and > remember the early 760 series standards may recognize those > precedence levels. They are: > > FLASH OVERRIDE (FO) -FO takes precedence over and preempts all > calls on the DSN and is not preemptible. FO is reserved for the > President of the United States, Secretary of Defense, Chairman > of the Joint Chiefs of Staff, chiefs of military services, and > others as specified by the President. > > FLASH (F) -FLASH calls override lower precedence calls and can > be preempted by FLASH OVERRIDE only. Some of the uses for FLASH > are initial enemy contact, major strategic decisions of great > urgency, and presidential action notices essential to national > survival during attack or preattack conditions. > > IMMEDIATE (1) -IMMEDIATE precedence preempts PRIORITY and > ROUTINE calls and is reserved for calls pertaining to > situations that gravely affect the security of the United > States. Examples of IMMEDIATE calls are enemy contact, > intelligence essential to national security, widespread civil > disturbance, and vital information concerning aircraft, > spacecraft, or missile operations. > > PRIORITY (P) -PRIORITY precedence is for calls requiring > expeditious action or furnishing essential information for the > conduct of government operations. Examples of PRIORITY calls > are intelligence; movement of naval, air, and ground forces; > and important information concerning administrative military > support functions. > > ROUTINE (R) -ROUTINE precedence is for official government > communications that require rapid transmission by telephone. > These calls do not require preferential handling. > > > When I was involved in DSN communications in Europe, my unit > had a Flash precedence phone line, mainly because we had a > special mission (which is about all I can say). We had the > capability of bumping everybody off the DSN network save for > the CINC US Army Europe and a few other folks. You will most > likely have to deal with the issue of precedence. Also, access > to a commercial line is normally done with dialing a 9 first > (typical for trunk access); DSN usually uses an 8 - Your > mileage may vary; check your local listings. > > Finally, DSN uses a slightly different dial plan than the rest > of the universe (go figure:-) While you may be able to access > the US with a country code of 001, or Germany with a country > code of 49, that's not how it's done with DSN. Access is > determined by regions, and each region has its own "country > code". The regions are: > > Canadian Section > Caribbean Section > CONUS Section > European Section > Pacific/Alaska Section > Southwest Asia Section > > All of the above information is public knowledge and freely > available. Anything more is likely classified, and not subject > to posting on this list. In case it isn't already clear at > this point, DSN is totally separate from the PSTN. > > HTH, > > Paul Werner > > > > I am working on an IP telephony solution and I need to hook > in to the > > DSN. > > From my current understanding DSN is sent out to the local > telco via the > > PSTN and is routed from there. This would make for a fairly > simple dial > > plan > > in Call Manager. Has anybody heard anything different about > how DSN is > > setup to work? > > ________________________________________________ > Get your own "800" number > Voicemail, fax, email, and a lot more > http://www.ureach.com/reg/tag Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=29883&t=29805 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
