I am in need to update DNS for one of my VGW routers. I know there will be an impact if this router is used for MGCP. but i would like to know what if this router is used as Gatekeeper or if this router is connected to a gatekeeper?
How will i know if this change of DNS will have an impact?
Yes. You will need to update the FQDN in CUCM for the MGCP gateway.
Same story goes for H.323 if the gatekeeper zones reference the DNS name: you'll need to update them. If the router you are modifying is the gatekeeper itself than any registered devices (eg gateways, MCUs, etc.) will need the new FQDN. Conversely, if the router you are registering to is a gateway that registers to a gatekeeper then you may need to update the config of the gatekeeper unless it is entirely technology-prefix based and has nothing specific to a particular gateway registrant.
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You can use the CLI command 'show risdb query sip' to check the status of SIP Trunks on Cisco Unified Communications Manager (Unified CM, CUCM).
admin:show risdb query sip
----------- SIP Information -----------
Number of SIP entries: 1