The Asterisk server (pre-configured with two FXO channels) is configured to get dynamic IP address.
Once I install the PBX I don’t want the customer to log in to check the IP address (which is necessary to know to the configure IP phones). Instead I want him to be able to get IP address by calling the pbx via PSTN. If someone calls the PBX via PSTN and enters certain key combination, the PBX should play back the IP address.
Please let know how this can be done. It will be great if someone can point to something similar if previously done.