Does anyone have any more information of what this command does besides what is found in the documentation. And why it is required to get calls going from CUCM to Gatekeeper to CUBE to CUCME.
the description is a little unclear and not worded very cleary (can someone hire Cisco a technical writer please). What i think it is doing is forcing CUBE to send a h225 connect message to CUCM even though h.245 capabilities exchange has not taken place. But not sure. I would also think if you uncheck the wait for h245 capability exchange on cucm gatekkeeper trunk then it would force cucm to start the h.245 exchange and this would take place. Usage Guidelines Calls placed through a Cisco Unified Border Element may fail to connect when the originating or terminating H.323 device is a non-Cisco IOS VoIP device such as Cisco Unified Communications Manager. The default behavior of H.323-to-H.323 calls through a Cisco Unified Border Element is to delay sending a H.225 Connect message to the originating H323 device until the H245 TCS/MSD/OLC negotiation takes place. During this process, an H.225 Connect message with an H.245 address present from the terminating H.323 device is changed to an H.225 Progress message, followed by an H.225 Facility message with the embedded H.245 address. This can cause connection failures if the originating H.323 device is waiting for the H.225 Connect message to begin the H245 TCS/MSD/OLC negotiation. The *h225 connect-passthru* command is used to immediately pass H.225 connect messages from the trunking gateway to the outgoing gateway via a Cisco Unified Border Element. Configuring the *h225 connect-passthru* command in H.323 voice-service configuration is recommended for all calls passed through the Cisco Unified Border Element. This command option will be present only when the * allow-connections* command is configured. This command is often configured with the *h245 passthru tcsnonstd-passthru*command and *emptycapability* command when interworking is configured between non-Cisco IOS H.323 devices.
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