The following SMS server ports for devices are optional.
| Port | Service | From | To | Description |
| 123/UDP | NTP | IPS | SMS server | Required only if IPS uses SMS for NTP time synchronization. |
| 6343/UDP | sFlow® | IPS | sFlow server | Send sFlow data from TPS devices running TOS v5.x.x or later to one or more sFlow servers. |