OnPhoneDial

using System.Linq;
using System;
using System.Collections.Generic;
using Newtonsoft.Json;
using Oxide.Core;
using UnityEngine;

namespace Oxide.Plugins
{
    [Info("Phone Team Dial", "RustPluginGenerator", "1.0.0")]
    [Description("Restricts telephone dials to teammates and optionally requires a permission")]
    public class PhoneTeamDial : RustPlugin
    {
        private const string PermUse = "phoneteamdial.use";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Require permission to dial")]
            public bool RequirePermission { get; set; } = true;

            [JsonProperty("Block calls outside the caller's team")]
            public bool TeamOnly { get; set; } = true;
        }

        protected override void LoadDefaultConfig() => config = new PluginConfig();

        protected override void LoadConfig()
        {
            base.LoadConfig();
            try
            {
                config = Config.ReadObject<PluginConfig>();
                if (config == null) throw new Exception();
            }
            catch
            {
                PrintWarning("Configuration file is invalid, using defaults");
                LoadDefaultConfig();
            }
            SaveConfig();
        }

        protected override void SaveConfig() => Config.WriteObject(config);

        protected override void LoadDefaultMessages()
        {
            lang.RegisterMessages(new Dictionary<string, string>
            {
                ["NoPermission"] = "You do not have permission to use the telephone network.",
                ["NotTeam"] = "You can only call members of your own team."
            }, this);
        }

        private string Msg(string key, string userId = null) => lang.GetMessage(key, this, userId);

        private void Init()
        {
            permission.RegisterPermission(PermUse, this);
        }

        private object OnPhoneDial(PhoneController phoneController, PhoneController telephone, BasePlayer currentPlayer)
        {
            if (currentPlayer == null || telephone == null) return null;

            if (config.RequirePermission && !permission.UserHasPermission(currentPlayer.UserIDString, PermUse))
            {
                currentPlayer.ChatMessage(Msg("NoPermission", currentPlayer.UserIDString));
                return false;
            }

            if (!config.TeamOnly) return null;

            BaseEntity entity = telephone.baseEntity;
            if (entity == null) return null;

            BasePlayer target = BasePlayer.FindByID(entity.OwnerID);
            if (target == null || target.userID == currentPlayer.userID) return null;

            if (IsSameTeam(currentPlayer, target)) return null;

            currentPlayer.ChatMessage(Msg("NotTeam", currentPlayer.UserIDString));
            return false;
        }

        private bool IsSameTeam(BasePlayer player, BasePlayer other)
        {
            if (player.currentTeam == 0 || player.currentTeam != other.currentTeam) return false;

            var team = RelationshipManager.ServerInstance?.FindTeam(player.currentTeam);
            return team != null && team.members != null && team.members.Contains(other.userID);
        }
    }
}