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5.3.4.4 General recommendations<br />

5.3.4.4.1 Network engineering<br />

- In SIP mode there must be no NAT/PAT device between the mobile and OmniPCX Office<br />

- A DHCP server is required. As of R9.1, the OmniPCX Office’s embedded DHCP server<br />

can be used for serving mobiles. However the OmniPCX Office’s DHCP server has a limit<br />

of 20 entries, which can be reached when fixed IP mappings are used.<br />

- The DHCP server must be configured to send default gateway and DNS servers if the<br />

iPhone requires WAN access.<br />

- Voice traffic can be segregated into a separate VLAN. In this case, a mapping between the<br />

VLAN and SSID must be implemented at the access point. Consequently, the Mobile with<br />

the dual mode application must have a specific SSID.<br />

- A QoS policy is recommended for VoIP with packet taggings: DSCP of 46 and 802.1p<br />

priority of 6.<br />

This policy must be enforced on all network devices on the path between the mobile and<br />

OmniPCX Office.<br />

- If a firewall is implemented between the WLAN and the LAN, the rules must allow the<br />

flows, see table below.<br />

It is also helpful for debugging to allow the ping – protocol ICMP ECHO.<br />

5-105

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