Call delivery in a CDMA legacy MS domain for SIP call origination
US8199727B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2004 |
| Grant date | Jun 12, 2012 |
| Priority date | — |
| Expiry date | May 17, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/181
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and a method in a wireless network utilizing session initiation protocol (SIP) for call control. The SIP payload (SDP) contains a list of available transcoders (codecs) to coordinate transcoder selection to allow for the minimization of transcoders. An additional aspect of the embodiment of the present invention includes a serving MSCe that is operable to determine whether to initiate ringback to the calling party. If ring back is to be initiated, ringback can be initiated from the serving MSCe or from a network element supporting the calling party. The call negotiation process according to the described embodiment of the invention eliminates the requirement for any transcoding in specific situations to result in the number of transcoders used in the voice bearer path to be reduced to 0 (TrFO, Transcoder Free Operation) or to 1 (RTO, remote transmitter operation).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.