Obihai: OBi504vs

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Extremely cost-effective, with cutting-edge technology, the ultra-flexible OBi504vs systems can be configured to be used for a multitude of voice and fax applications. Businesses using premise-based open-standard platforms such as Asterisk, FreePBX, PBX In a Flash, or other SIP-based system will be able to leverage the OBi504vs' versatitility.

Related Links:

Currently Recommended Firmware:  v4.0.5 5980 has officially certified these devices after completing rigorous testing, designed to push these devices to the limit, and we're happy to say that the OBi504vs has passed our requirements to make it to our Certified Device List. We've included a simple configuration guide on this page to help you get up and running. If you have any trouble, please open up a support ticket and one of our engineers will assist you as soon as possible!

Important Note: Please keep in mind, after you've configured each section, be sure to Submit your changes, and if the device requires it, be sure to Reboot your device to ensure that your configuration options are retained.

After following this guide, you may want to set up the second analog line per our Obihai Advanced Configuration Guide. It will show you how to configure two fax machines to independently use two separate numbers over one T38Fax trunk.


1. Firmware

Please upgrade your firmware to the newest version available. See the currently recommended firmware link above. You can do so from the "System Management" menu:



Next, select the "SIP" section under ITSP Profile A. Here you'll need to configure several options:

Configuration Option Required Value
ProxyServer :
ProxyServerPort : 5080
X_DiscoverPublicAddress : Disabled



3. SP1 Service

Next, navigation to the Voice Services menu, and select SP1 Service, this is where you'll configure your SIP Credentials to link into our service. Under SIP Credentials, configure the following. If you have more than one device at a site, each device at a site should have a unique port = 5080.

Configuration Option Required Value
X_AcceptSipFromRegistrarOnly : Enabled (Check the Box)
X_UserAgentPort : 5080
AuthUserName : SIP Username
AuthPassword : SIP Password



4. Codecs

Finally, you'll need to navigate to the Codecs menu, and select the Codec Profile A sub-menu. Scroll to the bottom of this menu, and find the "Fax Event" section. Enable this by unchecking the default box and checking the enable checkbox. Then, under the "Codec Settings" section, you will need to set the following:

Configuration Option Required Value
T38ECM : Enabled (Check the Box)
T38Reinvite : Callee Only

At this point, you should be able to check the System Status page (Under the Status menu) and see that SP1 is registered, like so:



5. Fax Machine

Finally, configure your fax machine to work properly with your Power-T.38 SIP Trunk. Review our Recommended Fax Machine Settings for details.


Advanced Configuration

This guide has walked you through setting up one analog port on the OBi500vs to use a T38Fax trunk. If you're interested in using multiple analog ports through a single T38Fax trunk, our Advanced Configuration Guide will build on the configuration laid out in this guide to make that possible.

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