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Is VoIP-to-VoIP hair-pinning supported on IOS gateways?

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Plain Old Telephone Service (POTS)-to-POTS hair-pinning is supported on all Cisco IOS  Software gateways.

Currently, VoIP-to-VoIP hair-pinning is not supported on Cisco IOS voice-enabled platforms.

For more information, refer to the Relationship Between Dial Peers and Call Legs section of Understanding Dial Peers and Call Legs on Cisco IOS Platforms.

Voice Gateways

IOS gateways

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