Nighthawk M2 - IP Phone on LAN

Hello All,

I am interested in purchasing this for our business temp solution outside of our office, we want to use the LAN port on the MR2100 with our Yealink T42S office phone which is preconfigured by our hosted setup.

Basically my question is could it be used with an IP Phone?

Do you know if SIP ALG can be turned off in configuration settings, would this modem be stable enough over 4G for use with a VOIP Phone? Could QOS be turned on?

Thank you in advance.