Update Set-CsPhoneNumberAssignment.md

adding description for reverse number lookup

Author: michbrown-png

teams/teams-ps/teams/Set-CsPhoneNumberAssignment.md

@@ -257,6 +257,21 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### -ReverseNumberLookup
+This parameter is used to control the behavior of reverse number lookup (RNL) for a phone number.When RNL is set to 'SkipInternalVoip', an internal call to this phone number will not attempt to pass through internal VoIP via reverse number lookup in Microsoft Teams. Instead the call will be established through external PSTN connectivity directly.
+
+```yaml
+Type: String
+Parameter Sets: (ReverseNumberLookupUpdate, Assignment)
+Aliases:
+
+Required: True
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
 ### CommonParameters
 This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see [about_CommonParameters](https://go.microsoft.com/fwlink/?LinkID=113216).