2.2.8 Remote Site Address Response
The Remote Site Address Response attribute is sent by the server in response to a Reservation Check request message that contained a Remote Site Address attribute. It indicates to the client the availability of the Remote Site Address as a viable transport address to be used for media connectivity.
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Maximum Send Bandwidth |
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Attribute Type (2 bytes): The TURN attributes are specified in [IETFDRAFT-STUN-02] section 10.2 and [IETFDRAFT-TURN-08] section 9.2. Set to "0x805D".
Attribute Length (2 bytes): Set to "0x000C".
A - Valid (V) flag (1 bit): Identifies whether the Remote Site Address is a valid transport address and can be included in the connectivity check as specified in section 3.2.5.1. If the network path between the Remote Site Address and Local Site Address passed the bandwidth admission policy check, the server sets the flag (V = "1"). If the network path between the Remote Site Address and the Local Site Address failed the bandwidth admission policy check, the server clears the flag (V = "0").
B - PSTN Failover (F) flag (1 bit): Used by the server to inform the client of the option of failing over to public switched telephone network (PSTN) if the network path between the Remote Site Address and Local Site Address failed the bandwidth admission policy check. If the V flag is cleared (V = "0") and this flag is set (F = "1"), the client can attempt to re-route the call over the PSTN.
Reserved (30 bits): These bits MUST be set to zero on send and ignored on receive.
Maximum Send Bandwidth (4 bytes): The maximum amount of bandwidth available for sending data from the Remote Site Address. This value is within the bandwidth range requested in the Check Request message. The server sets this field to zero if the network path between the Remote Site Address and the Local Site Address fails the bandwidth admission policy check.
Maximum Receive Bandwidth (4 bytes): The maximum amount of bandwidth available for receiving data into the Remote Site Address. This value is within the bandwidth range requested in the Check Request message. The server sets this field to zero if the network path between the Remote Site Address and the Local Site Address fails the bandwidth admission policy check.