What session attribute value is utilized when a calling device wants to place the other party on hold?

When a calling device wishes to place the other party on hold, the appropriate action involves sending a specific session attribute value known as the "Hold attribute." This attribute indicates to the receiving party that the caller intends to pause the active communication, allowing the other party to be aware that they are currently on hold and not engaged in conversation.

This signaling is an integral part of the communication process in systems that follow SIP (Session Initiation Protocol) standards, as it helps manage the state of the call effectively. On the other hand, options that suggest no specific value is used, or that specific hold signaling is not defined, do not align with how SIP handles call states. The reference to setting a codec, like G.711, is unrelated to the action of placing someone on hold, as codec negotiation pertains to the audio encoding rather than call state signaling.