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The The 

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supports configuring up to 14 254 alternate media IP addresses using the parameter altMediaIpAddresses when configuring IP interfaces. Any combination of IPv4 and IPv6 is allowed and applies to all supported protocols (SIP, H.323, GW-GW).

A total of 4,096 IP Addresses are supported.

The below table provides just a few examples of IP address/alternate IP address/alternate Media IP address combinations equaling 4,096 IP addresses.

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0 Table 1 IP Address Distribution Examples
Example IP Address Combinations  No. Interfaces Assign 16 256 IP addresses to each of a set of 256 16 IP interfaces 1 primary IP Addresses + 1 Alternate IP Address + 14 254 Alternate Media IP Addresses 25616 Assign 8 IP 128  IP addresses to each of a set of 512 32 IP interfaces 1 Primary IP Address + 7 127 Alternate Media IP Addresses 51232 Assign a single primary IP address to each  of the 4,096 interfaces 1 Primary IP Address 4,096

Note
Most user configurations will not need 4,096 IP interfaces.

 

Alternate Media IPs are chosen based on Round Robin method (e.g. for example, the first call uses the primary IP and port, the second call uses the first configured alternate Media IP and port, the third call uses the second configured alternate Media IP, etc.and so on). Each alternate Media IP must be unique across all interfaces in the same addressContext. However, the IPs may overlap between SIP, H.323 or Gateway signaling IP addresses in the same Address Context.

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