Because in this case the phones are expected to register with CallManager under normal operation, they need to be configured to receive their configuration files from the CallManager TFTP server. If you have configured SRST in Callmanager, the said configuration files will indicate that the phones are to register with the CallManager servers first, and if those become unavailable, then they should register with the SRST gateway.
So we still need to define the CCM as the TFTP server for option 150 in order to allow the phones to receive their configuration files that will let them know the which CCM and which SRST gateway they should register with.
What happens if an IP phone reboot during a WAN outage? I know that the phone will be assigned an IP address because of the DHCP service enabled on the SRST router, but does the option 150 have any purpose in this case? Does the phone still need to download the latest configuration when it reboots?
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Please find the attached HTML document, download and open it on your PC.
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