Multiple in, multiple out.

code/game/objects/items/storage/backpack.dm

@@ -497,7 +497,7 @@ GLOBAL_LIST_EMPTY_TYPED(radio_packs, /obj/item/storage/backpack/marine/satchel/r
 	var/obj/structure/transmitter/internal/internal_transmitter
 
 	var/phone_category = PHONE_MARINE
-	var/network_receive = FACTION_MARINE
+	var/list/networks_receive = list(FACTION_MARINE)
 	var/list/networks_transmit = list(FACTION_MARINE)
 	var/base_icon
 
@@ -523,7 +523,7 @@ GLOBAL_LIST_EMPTY_TYPED(radio_packs, /obj/item/storage/backpack/marine/satchel/r
 	internal_transmitter.relay_obj = src
 	internal_transmitter.phone_category = phone_category
 	internal_transmitter.enabled = FALSE
-	internal_transmitter.network_receive = network_receive
+	internal_transmitter.networks_receive = networks_receive
 	internal_transmitter.networks_transmit = networks_transmit
 	RegisterSignal(internal_transmitter, COMSIG_TRANSMITTER_UPDATE_ICON, PROC_REF(check_for_ringing))
 	GLOB.radio_packs += src
@@ -593,7 +593,8 @@ GLOBAL_LIST_EMPTY_TYPED(radio_packs, /obj/item/storage/backpack/marine/satchel/r
 		. = ..()
 
 /obj/item/storage/backpack/marine/satchel/rto/upp_net
-	network_receive = FACTION_UPP
+	name = "\improper UPP Radio Telephone Pack"
+	networks_receive = list(FACTION_UPP)
 	networks_transmit = list(FACTION_UPP)
 
 /obj/item/storage/backpack/marine/satchel/rto/small
@@ -602,7 +603,8 @@ GLOBAL_LIST_EMPTY_TYPED(radio_packs, /obj/item/storage/backpack/marine/satchel/r
 
 
 /obj/item/storage/backpack/marine/satchel/rto/small/upp_net
-	network_receive = FACTION_UPP
+	name = "\improper UPP Radio Telephone Pack"
+	networks_receive = list(FACTION_UPP)
 	networks_transmit = list(FACTION_UPP)
 	phone_category = PHONE_UPP_SOLDIER
 

code/modules/cm_phone/phone.dm

@@ -31,7 +31,7 @@ GLOBAL_LIST_EMPTY_TYPED(transmitters, /obj/structure/transmitter)
 	var/timeout_timer_id
 	var/timeout_duration = 30 SECONDS
 
-	var/network_receive = FACTION_MARINE
+	var/list/networks_receive = list(FACTION_MARINE)
 	var/list/networks_transmit = list(FACTION_MARINE)
 
 /obj/structure/transmitter/hidden
@@ -82,7 +82,12 @@ GLOBAL_LIST_EMPTY_TYPED(transmitters, /obj/structure/transmitter)
 		var/obj/structure/transmitter/target_phone = possible_phone
 		if(TRANSMITTER_UNAVAILABLE(target_phone) || !target_phone.callable) // Phone not available
 			continue
-		if(!(target_phone.network_receive in networks_transmit))
+		var/net_link = FALSE
+		for(var/network in networks_transmit)
+			if(network in target_phone.networks_receive)
+				net_link = TRUE
+				continue
+		if(!net_link)
 			continue
 
 		var/id = target_phone.phone_id
@@ -540,7 +545,7 @@ GLOBAL_LIST_EMPTY_TYPED(transmitters, /obj/structure/transmitter)
 
 
 /obj/structure/transmitter/colony_net
-	network_receive = FACTION_COLONIST
+	networks_receive = list(FACTION_COLONIST)
 	networks_transmit = list(FACTION_COLONIST)
 
 /obj/structure/transmitter/colony_net/rotary

maps/map_files/LV624/standalone/clfship.dmm

@@ -162,7 +162,7 @@
 /area/lv624/lazarus/crashed_ship)
 "fA" = (
 /obj/structure/transmitter/colony_net{
-	network_receive = "CLF";
+	networks_receive = list("CLF");
 	networks_transmit = list("CLF");
 	phone_category = "CR-116";
 	phone_id = "Armoury";
@@ -667,7 +667,7 @@
 /obj/structure/surface/table/reinforced/prison,
 /obj/effect/spawner/random/toolbox,
 /obj/structure/transmitter/colony_net/rotary{
-	network_receive = "CLF";
+	networks_receive = list("CLF");
 	networks_transmit = list("CLF");
 	phone_category = "CR-116";
 	phone_color = "yellow";
@@ -1662,7 +1662,7 @@
 "Qj" = (
 /obj/structure/machinery/body_scanconsole,
 /obj/structure/transmitter/colony_net{
-	network_receive = "CLF";
+	networks_receive = list("CLF");
 	networks_transmit = list("CLF");
 	phone_category = "CR-116";
 	phone_color = "green";
@@ -1994,7 +1994,7 @@
 /area/lv624/lazarus/crashed_ship)
 "XM" = (
 /obj/structure/transmitter/colony_net{
-	network_receive = "CLF";
+	networks_receive = list("CLF");
 	networks_transmit = list("CLF");
 	phone_category = "CR-116";
 	phone_id = "Cargo Bay";