I wanted to enable MPS function on OS7100 v4.40 to save some MGI chanels, but i lost audio on remote IP phones. Does MPS exclude when you have some remote IP phones? There are few local IP phones, some digital phones, SIP trunks, and 3 remote IP phones. I'd appreciate any suggestion.

There is an additional range of ports that are required to use MPS and remote phones.

More information about your setup (software version, any MGI/OAS cards) is needed before I can advise on exactly what you need todo

This is OS7100 with MP10 v4.40 and with SW licenses for 6 MGI. Other cards in cabinet are 16DLI and UNI. Remote IP phones are ITP 5021D v3.21. You think additional range of ports will solve the problem?

Yes, if you forward UDP 40000-40031 to the 7100 MP card.
Also upgrade the ITP to 3.37 otherwise you will have DTMF issues on the SIP trunks

Great! I'll try this. Sadly I haven't found this in Samsung documentation...