The maximum available bandwidth between the two given
regions.
unknown: Unknown Bandwidth
other: Unidentified Bandwidth
bwG723: For low bandwidth using G.723 codec
bwG729: For low bandwidth using G.729 codec
bwG711: For high bandwidth using G.711 codec
bwGSM: For GSM bandwidth 13K
bwWideband: For Wideband 256K.