3.17. Voice over IP over Frame Relay
In previous releases of IP Office software Voice over IP on Frame Relay was only supported when PPP encapsulation was used. IP Office 1.4 introduces further Frame Relay enhancements, which allows the support of Voice over IP on Frame Relay when using RFC1490 encapsulation. In order to provide QoS when using RFC1490 encapsulation, FRF12 fragmentation has been implemented with IP Office 1.4 software.
When using RFC1490 + FRF12 it should be noted that all parameters on the Service | PPP tab are ignored. In this instance the IPHC parameters are configured within the DLCI configuration form of the WAN Port tab. It is imperative that all IPHC values are matched at each end of the link.
Implementation of these additional standards will increase the support for QoS with a number of third party vendor networks, such as Cisco.
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