H.323 Configuration Guide, Cisco IOS XE Release 3S

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The following secure encrypted services are not supported in Cisco IOS Release 12.4(6)T1:

Voice security during conferencing, transcoding, and music-on-hold.
Secure Cisco IOS SIP (Session Initiation Protocol) gateways and call flows.
H.323 endpoints other than those listed in Table 1.
Interworking scenarios on the Cisco IOS IP-to-IP gateway, including:
- Fast start to slow start signaling
- Slow start to fast start signaling
The call failure retry (rotary) feature on the Cisco IOS IP-to-IP gateway.

Table 1 lists supported gateways, network modules, and codecs for voice security features.

Table 1 Supported Gateways, Network Modules, and Codecs for Voice Security Features

Supported Gateways	Supported Network Modules	Supported Codecs
Cisco 2600XM Cisco 2691 Cisco 2811 Cisco 2821 Cisco 2851 Cisco 3725 Cisco 3745 Cisco 3825 Cisco 3845 Cisco VG224 Cisco IAD 2430	AIM-VOICE AIM-ATM-VOICE-30 EVM-HD NM-HDA NM-HDV NM-HDV2 NM-HDV2-1T1/E1 NM-HDV2-2T1/E1 NM-HD-1V NM-HD-2V NM-HD-2VE PVDM2	G.711 mu-law G.711 a-law G.729 G.729A

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