Restrictions
The following restrictions and limitations are applicable for this configuration:
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Only one line number per FXS port is supported, and shared line is not supported.
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The line side SIP endpoints are controlled by one CUCM only. Switch over and switch back are not supported.
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Non-DSAPP-controlled devices are not supported. You must configure 'service dsapp' before you configure pots dial-peer and voip dial-peer.
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You cannot combine IPv4 and IPv6 in this configuration.
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The SIP analog calls go through the CUCM, and hairpin calls are not supported.
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SIP analog ports signaling for failover between the CUCMs is not supported.
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3-way conference only supports G711 codec.
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Media recording, overlap dialing, secure calls, failover, and fallback are not supported.
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In the CUCM web interface, you can add more than one line under Phone Configuration. However, only the first line will be associated with the phone, and the rest of the lines will not be applied