I have a configured MP-114 that is working as expected with my Asterisk but I recently obtained an MP-112 (2xFXS) which can register with asterisk but can only dial 3 digits extension, anything longer than 3-digits is cut off.

It seems that the setting “Max Digits In Phone Num” was set to 3 in:

Configuration->VoIP->GW and IP to IP->DTMF and Supplementary ->DTMF & Dialing

If you are having problems with this, check out this option.

Note: The MP-114 is an Analog Media Gateway product which is based on AudioCodes’ field-proven and best-of-breed VoIP technology. Featuring a 4 port gateway, this device connects analog terminals, PBXs or key systems to the IP network using FXS and FXO connectivity. Compliant with multiple protocols including SIP, H.323 and MGCP, the Analog Media Gateway enables flexible deployment and interoperability for the evolving next generation networks. Using AudioCodes’ Analog Media Gateways, Network Equipment Providers and System Integrators can effectively deliver carrier-hosted converged services as well as enterprise-based applications. It is certified for use with Asterisk, Broadsoft, Sylantro, PBXnSIP, Sphere and other soft switches.