US 7,412,035 B2 · External detection of optional telephone services on a telephone line

Abstract

Determining whether a call forward busy service is enabled on a telephone line includes placing a first test call across a network to the telephone line. First signaling data is received through the network in response to the first test call. The first signaling data is evaluated to determine whether the first test call is inspiring a ringing condition. A second test call is placed across the network conditioned on whether the first signaling data indicates that the first test call is determined to be inspiring a ringing condition. The second test call is placed while the first test call remains inspiring ringing. Second signaling data is received through the network in response to the second test call. A call forward busy service is concluded to be enabled on the telephone line based on whether the second test call is determined to be inspiring a ringing condition.

Claims20

Dependent claims

A method comprising:

placing a preliminary test call to a telephone line over a network;
in response to the preliminary test call, receiving first signaling data through the network;
evaluating the first signaling data to determine whether a busy or disconnect signal is received from the network in response to the preliminary test call;
if it is determined that the busy or disconnect signal is not received in response to the preliminary test call, placing a follow-up test call to the telephone line, the follow-up test call being placed while the preliminary test call remains connected;
in response to the follow-up test call, receiving second signaling data though the network;
evaluating the second signaling data to determine whether a busy or disconnect signal is received from the network in response to the follow-up test call;
and
if it is determined that the busy or disconnect signal is not received in response to the follow-up test call, concluding that the telephone line has an optional telephone service enabled.

5 more elements

Dependencies are inferred from the claim text.

External detection of optional telephone services on a telephone line

Life of this patent

External detection of optional telephone services on a telephone line

Life of this patent

Abstract

Claims20