0x01F0 Number of UDP Ports

Specifies the total number of RFC 2833/RTP/UDP ports that the CSP is allowed to open. For a multiport scheme, this number is the number of RFC 2833 channels requested by a host application. Select 0 to specify that only one port needs to be opened that will multiplex all of the RFC 2833 streams. Any value other than 0 implies a multi-port scheme and the actual number of UDP ports required for each RFC 2833 channel basis.

Used in:
VoIP Protocol Configure message
VoIP Protocol Query message

Byte | Description
0, 1 | Tag 0x01F0
2, 3 | Length 0x0002
4, 5 | Value[0,1] 0 - implies single port scheme. 1 is the default Any other value implies multiport scheme. The number should be equal to or less than the the CSP maximum channel capacity.

Real-Time Transport Protocol. Supports transport of real-time data like interactive voice and video over packet-switched networks.
Voice over Internet Protocol. The delivery of voice information in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public-switched telephone network (PSTN).