Integrating Mitel 3300 with Mitel Border Gateway

[pradeepgali]

I am trying to setup Mitel 3300 with Mitel Border Gateway. When  i make an inbound call from PSTN to Mitel phone. The call works fine with no problem. When i make an outbound call from Mitel phone to PSTN, i can see Mitel 3300 is sending Invite to Mitel Border Gateway(MBG) and MBG is replying with "404 Not found". It looking the configuration issue in MBG.  I am looking configuration help in MBG. Please let me know if any one is aware of this issue.

[x-man]

Is this for using the MBG as the SIP gateway/proxy?

[pradeepgali]

This is for using MBG as a IP Gateway. Network Profile: Gateway mode
Question: Do I need to create two SIP trunks? one for inbound and one for outbound? Right now i have created only one SIP trunk and directed Remote trunk end point address to Service provider provisioned IP address.

[pradeepgali]

Just want to make the issue clear. The way the Mitel 3300 and MBG is connected is as shown in figure below. The network profile selected in MBG is Gateway mode. Inbound calls from PSTN to Mitel 3300 are working fine wothout any problem. But the Oubound calls from Mitel 3300 to PSTN are not working(Getting 404 not found from the the LAN side of MBG to Mitel 3300).