The TFTP option would normally be associated with the inside IP address of the LAN, and is the same source-address specified under the telephony-service.
If you have a remote site LAN which have IP Phones that are expected to register with the main-office CME gateway, then the TFTP option should be the same.
As Brandon said make sure you can ping public IP address, but more importantly make sure that the ACLs on the main office gateway allow the traffic through from the outside to the inside for TFTP to the remote LAN.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
Over the last few months, I have had the privilege of working on SI...
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...