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| About Voice over IP (VoIP) |
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| Stage | Packet Transferred | Description (continued) |
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| 3 | SoTCP Internal Call | Once the destination IP node receives the |
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| Accept | ACP call accept from the remote voice |
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| port, it sends a SoTCP Internal Call Accept |
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| to the source IP node. The remote port’s |
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| UDP port number is included in this packet |
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| to inform the other end of its UDP port |
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| number. The connection between the nodes |
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| is now established. |
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| 4 | ACP Call Accept | The source IP node sends an ACP Call |
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| Accept to the voice port and the port may |
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| begin to send voice packets to the |
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| destination. |
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Data Transfer | The SoTCP protocol attaches the 3 or | ||
| protocol then sends voice packets over the UDP channel. | ||
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Voice Over IP | 7 |
Revision 5.2 |
