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2. The called party answers with one codec/framing in the SDP part of the 200.OK response<br />

3. The Alcatel-Lucent OmniPCX Office Communication Server acknowledges this response<br />

Codec/Framing Set to a Specific Value<br />

1. The Alcatel-Lucent OmniPCX Office Communication Server sends the configured<br />

codec/framing (e.g. G723_30) in the SDP part of the INVITE message.<br />

2. The called party either accepts or rejects the call.<br />

Incoming Calls<br />

Codec/Framing Set to default<br />

First Case<br />

1. The caller sends a list of codec/framing in the SDP part of the INVITE message.<br />

2. The Alcatel-Lucent OmniPCX Office Communication Server select the first supported<br />

codec/framing in the list.<br />

Second Case<br />

1. The caller sends a specific codec/framing in the SDP part of the INVITE message.<br />

2. If the proposed codec/framing is supported by Alcatel-Lucent OmniPCX Office<br />

Communication Server, the call is accepted. Otherwise, the call is rejected.<br />

Codec/Framing Set to a Specific Value<br />

First Case<br />

1. The caller sends a list of codec/framing in the SDP part of the INVITE message.<br />

2. If the codec/framing configured for Alcatel-Lucent OmniPCX Office Communication Server<br />

is in the list proposed by the caller, the call is accepted. Otherwise, the call is rejected.<br />

Second Case<br />

1. The caller sends a specific codec/framing in the SDP part of the INVITE message.<br />

2. If the proposed codec/framing matches the codec/framing configured for Alcatel-Lucent<br />

OmniPCX Office Communication Server, the call is accepted. Otherwise, the call is<br />

rejected.<br />

Music On Hold and preannouncement (as of R9.0)<br />

The G711 Codec for Music on Hold and preannouncement parameter allows using in<br />

priority G711 codec to play:<br />

- Music on Hold on SIP trunk, when:<br />

• Codec/Framing set to default<br />

• The codec list defined by noteworthy address AlCodLst (see Public SIP Trunking -<br />

Configuration procedure - Appendix: Noteworthy Addresses for Codec/Framing<br />

Negotiation ) contains G711 codec.<br />

- Preannouncement on SIP trunk incoming calls.<br />

6.4.2.3.16 Codec Pass-Through<br />

PCX behavior depends on the Codec/Framing value in the Automatic Routing: Prefixes<br />

parameters, refer to Codec/Framing Negotiation .<br />

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