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The flight deck crewmembers can make announcements using a PA handset or by using any standard microphone and the related ACP. Flight Attendants make announcements using PA handset located at their stations. The attendants use the PA to play recorded music for passenger entertainment.
PA system use is prioritized. Flight deck announcements have first priority and override all others. Flight Attendant announcements override the music system.
Call System
The call system is used as a means for various crewmembers to gain the attention of other crewmembers and to indicate that interphone communication is desired. Attention is gained through the use of lights and aural signals (chimes or horn). The system can be activated from the flight deck, either flight attendant station, or from the external power receptacle. Passengers may also use the system to call an attendant, through the use of individual call switches at each seat.
The flight deck may be called from either flight attendant station or by the ground crew. The ground crew may only be called from the flight deck. Flight Attendants may be called from the flight deck, the other attendant station, or from any passenger seat or lavatory. Master call lights in the passenger cabin identify the source of incoming calls to the attendants.
Call system chime signals are audible in the passenger cabin through the PA system speakers. The PA speakers also provide an alerting chime signal whenever the NO SMOKING or FASTEN SEAT BELT signs illuminate or extinguish.
Copyright . The Boeing Company. See title page for details.
Communications -System Description 737 Flight Crew Operations Manual

YA626, YA686, YA721 - YK104
Location of Call Originator  Called Position  Visual Signal at Called Position  Aural Signal at Called Position 
Flight deck  Attendant station  Pink master call light  Two–tone chime 
Flight deck  Nose wheel well  Horn in nose wheel well 
Attendant station  Flight deck  Blue flight deck call light  Single high–tone chime 
Nose wheel well  Flight deck  Blue flight deck call light  Single high–tone chime 
Flight deck  Passenger cabin  NO SMOKING or FASTEN BELT signs illuminate/ extinguish  Single low–tone chime 

YA613, YA687
Location of Call Originator  Called Position  Visual Signal at Called Position  Aural Signal at Called Position 
Flight deck  Attendant station  Pink master call light  Two–tone chime 
Flight deck  Nose wheel well  Horn in nose wheel well 
Attendant station  Flight deck  Call light on the integrated audio control panel  Single high–tone chime 
Nose wheel well  Flight deck  Call light on the integrated audio control panel  Single high–tone chime 
Flight deck  Passenger cabin  NO SMOKING or FASTEN BELT signs illuminate/ extinguish  Single low–tone chime 

Copyright . The Boeing Company. See title page for details.
5.20.6  September 27, 2004

Communications -System Description 737 Flight Crew Operations Manual
VHF Communications
YA721 - YK104 Primary short–range voice communications is provided in the VHF range by three independent radios. Each radio provides for selection of an active frequency and an inactive (preselected) frequency. Voice transmission and reception are controlled at the related ACP.
YA613 - YA687 Primary short–range voice communications is provided in the VHF range by two independent radios. Each radio provides for selection of an active frequency and an inactive (preselected) frequency. Voice transmission and reception are controlled at the related ACP.
YA721 - YA809, YC411, YC413 VHF–1 control panel is located on the left side of the aft electronic panel and VHF–2 control panel on the right. VHF–3 has a transceiver only and is used for ACARS communication. The VHF–2 and VHF-3 antennae are located on the lower fuselage, VHF–1 is on the upper fuselage.
YC153, YC154, YD651 - YK104 The VHF/HF RTP-1 is located on the forward left side of the aft electronic panel, VHF/HF RTP–2 is on the forward right side and VHF/HF RTP–3 is on the aft portion of the panel. The VHF–2 and VHF-3 antennae are located on the lower fuselage, VHF–1 is on the upper fuselage.
YA613 - YA687 The VHF/HF RTP-1 is located on the forward left side of the aft electronic panel, VHF/HF RTP–2 is on the forward right side and VHF/HF RTP–3 is on the aft portion of the panel. The VHF–2 antennae is located on the lower fuselage and VHF–1 is on the upper fuselage.
Note: VHF antennae located on the lower fuselage are susceptible to multipath interference from nearby structures or vehicles. This may disrupt VHF communications. VHF antennae located on the upper fuselage are not as susceptible to this interference.
　
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