Is it possible that can we implement load the IP Phone firmware on the remote router (running DHCP local and set option 150 to the Call Manager IP address ) and managed on the HQ office Cisco Call Manager ?
You can use the load server method for firmware upgrades (besides Peer Firmware Sharing):
"One method is to use a local TFTP server just for the upgrades. The administrator can place a TFTP server in branch offices (particularly in branches that have a larger number of phones, or whose WAN link is not speedy or robust), and can configure the phones in those offices to use that particular TFTP server just for new firmware. With this change, phones will retrieve new firmware locally. This upgrade method would require the administrator to pre-load the phone firmware on the TFTP server in the branch and manually configure the TFTP server address in the "load server" parameter in the affected phone configurations. Note that the branch router may be used as a TFTP server."
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