US 7,519,002 B2
Method of switching between multiple call signaling protocol stacks in a voice quality tester and apparatus using same
James P. Quan, Colorado Springs, Colo. (US); and Samuel M. Bauer, Colorado Springs, Colo. (US)
Assigned to Agilent Technologies, Inc., Santa Clara, Calif. (US)
Filed on Aug. 22, 2002, as Appl. No. 10/225,145.
Prior Publication US 2004/0037228 A1, Feb. 26, 2004
Int. Cl. H04L 12/26 (2006.01)
U.S. Cl. 370—244  [370/248; 370/251; 715/734; 714/25; 714/46; 714/714] 8 Claims
OG exemplary drawing
 
1. A system to test voice quality over call path on a packet-based network, comprising:
a first voice quality tester (VQT);
a second VQT communicating with the first VQT via the call path;
a first call signaling stack to establish a call signaling path between the first and second VQTs according to a first call signaling protocol; and
a second call signaling stack to establish the call signaling path between the first and second VQTs according to a second call signaling protocol, either the first or the second call signaling stack being selected by a user to establish the call signaling path, wherein the first VQT comprises:
a VQT application to generate control and data information;
a dynamic link library (DLL) to relay the information; and
a Media Over Packet Interface (MOPI) to receive the relayed information from the DLL, wherein the VQT application includes a graphical user interface (GUI), including a port setup screen, the user selecting the selected call signaling stack at the port setup screen, wherein the relayed information received by the MOPI includes a command which is specific to the selected call signaling stack, and the MOPI transfers the command to the selected call signaling stack.