I am trying to understand the usage of the alias command. I have two CMs and H323 ATA registered to the gatekeeper. I don't want to use tech-prefixes and I want gatekeeper to make all of its routing decisions based on the registered E164IDs. As CM does not register the E164 #s , I configured the following alias entry but it does not seem to work. Can somebody enlighten me about the usage of this command ? Thanks
zone local home cisco.com
zone local office cisco.com
alias static 172.25.3.102 1720 gkid office gateway voip ras 172.25.3.102 1719 e164 3903
no use-proxy office default inbound-to terminal
no use-proxy office default outbound-from terminal
Router#sh gatekeeper endpoints
GATEKEEPER ENDPOINT REGISTRATION
CallSignalAddr Port RASSignalAddr Port Zone Name Type Flags
I suspect the problem is not with the alias statement but rather with anonymous device support in CCM.
Alias statements provide the simplest form of RAS. They tell the GK to return a specific IP when a particular e164 is ARQed. No tech prefix is required, and default tech prefixes are not used in matching the e164. However, aliases _do_not_ depend on a endpoint be registered. Indeed, aliases are ideal for situations where an endpoint doesn't support ras. So there is no call state maintained in the GK.
I believe you are seeing the failure of Anonymous Device support in CCM. CCM will not accept h225 call setups from devices it is not aware of. There are three ways to get the CCM to accept a call from an h323 endpoint:
1) Configure the device in CCM as a h323 gateway. When a new CS from a h323 endpoint arrives, CCM compares the source IP address against those configured as gateways. If the IP is unknown, it will
2) ARQ its GK controlled trunks. If a GK responds with an ACF, then CCM will accept the call. If it receives an ARJ, or there are no GK controlled trunks, CCM will reject the Call. Also, since aliases don't require the GK to maintain call state information,
3) You may override this behavior in CallManager Service parameters by setting "Accept Unknown TCP Connection" to true. This is not a good idea as it could open you up to toll fraud.
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ISO images are as close as we can get to the old school classic IOS images from back in they day.
Doing upgrades by putting a new image on the flash, changing the boot pointer and reload was and is still the walhalla of Cisco based devices.