发明授权
- 专利标题： Tandem free operation over packet networks
- 专利标题（中）： 通过分组网络进行串联自由操作
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申请号： US10692233申请日： 2003-10-23
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公开(公告)号： US07876745B1公开(公告)日： 2011-01-25
- 发明人: Mark Stewart , Graeme Gibbs , Dominic Walker
- 申请人： Mark Stewart , Graeme Gibbs , Dominic Walker
- 申请人地址： CA Mississauga Ontario
- 专利权人： Nortel Networks Limited
- 当前专利权人： Nortel Networks Limited
- 当前专利权人地址： CA Mississauga Ontario
- 代理机构： Barnts & Thornburg LLP
- 主分类号： H04L12/66
- IPC分类号： H04L12/66 ; H04L12/28
摘要：
A packet-based network carries a stream of voice band data, such as PCM voice data, which can include tandem free operation (TFO) information. Voice data is usually subject to processing, such as compression, at an ingress entity. The ingress entity determines whether the stream of voice data contain tandem free operation (TFO) information and, if TFO information is present, sends the TFO information across the packet network without subjecting it to processing. This preserves the integrity of the TFO information. TFO information can be carried by an unprocessed channel having a bandwidth of less than 64 kbit/s. TFO information is reinserted at an egress entity of the packet network.