---
oid: "1.3.6.1.4.1.4935.99.100.1.5.15"
asn1-notation: "{iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) 4935 mediatrixExperimental(99) mgcpncsExperimentalMIB(100) mgcpncsExperimentalMIBObjects(1) mgcpncsInterop(5) mgcpncsG729AnnexBNegotiation(15)}"
description: "mgcpncsG729AnnexBNegotiation OBJECT-TYPE"
classification: "MIB object for network management"
last-modified: "2024-09-24"
---

## OID : `1.3.6.1.4.1.4935.99.100.1.5.15`

```asn1
{iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) 4935 mediatrixExperimental(99) mgcpncsExperimentalMIB(100) mgcpncsExperimentalMIBObjects(1) mgcpncsInterop(5) mgcpncsG729AnnexBNegotiation(15)}
```

### Description

```asn1
mgcpncsG729AnnexBNegotiation OBJECT-TYPE
SYNTAX MxEnableState
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Indicates if the G.729 Annex B is negotiated through
the session description protocol.
RFC 3555 (MIME Type Registration of RTP Payload
Formats), July 2003 explains how the Annex B can be
negotiated by using the session description protocol.
The Annex B indicates that Annex B, voice activity
detection, is used or preferred. Permissible values
are 'yes' and 'no' (without the quotes); 'yes' is
implied if this parameter is omitted.
m=audio 5004 RTP/AVP 0 18 13
a=fmtp:18 annexb=yes
disable:
The G.729 Annex B is NOT negotiated through the
session description protocol.
In that case, the G.729 Annex B is based on the
MIB variable voiceIfG729VoiceActivityDetectionEnable.
When this variable is set to 'enable', the G.729
codec negotiated as payload number 18 (G729)
supports the Annex B implicitly.
However, when the voiceIfG729VoiceActivityDetectionEnable
variable is set to 'disable', the G.729 codec
negotiated as payload number 18 (G729) does NOT
support the Annex B implicitly.
enable:
The G.729 Annex B is negotiated through the
session description protocol.
In that case, the G.729 Annex B is advertised in
the offer. The value depends on the MIB variable
voiceIfG729VoiceActivityDetectionEnable. If this
variable is set to 'enable', then the Annex B is
set to 'yes'; otherwise, the value 'no' is
advertised.
The answerer MAY not be able to support the Annex B.
In that case, the answer to the Annex B can be set
to 'no'. This forces the offerer not to use the
Annex B in G.729. However, the opposite is not
possible. The answerer can NOT force the offerer to
use the Annex B if this one does not bear such
capability."
DEFVAL {disable}
```

**Classification**: MIB object for network management

### Child OIDs

No child OID

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