SIP: Lift Expires: in REGISTER from 180 to 3600
45210331 adds to REGISTER the header Expire: 180
with NUTAG_M_FEATURES("expires=180")
. 45285062 changes the syntax to SIPTAG_EXPIRES_STR ("180"),
I think 180 is pretty low value, which causes a lot of messages to the server. Expires: 3600
is more reasonable. Snom and Linphone use 3600.
Please change the default Expires: to 3600, or at least to 1800, and ideally offer an option to the user to set the preferred value herself.