in sipx 3.8 a syslog server can be defined (on the 'Devices | Network Params' screen). If a syslog server is thus defined, then by default snom phones' configs will enable syslogging to that server. However, the snoms can generate a substantial amount of syslog output, and there's little reason to enable syslogging unless actively troubleshooting a problem. So, it would be better if syslogging were not enabled by default on the snoms.

Unfortunately, there's no on/off switch for syslogging on a snom. It's configured just by the presence of a syslog server's addr. So, in sipx there's no way to disable syslogging via a phonegroup, since the sipxconfig default is to include the syslog server addr (if defined in sipx as described above).