Toshiba's Sip Trunking I-Voip Service; Benefits; Requirements; Interactions - Toshiba IP edge General Description Manual

Toshiba's SIP Trunking I-VoIP Service

Benefits

• SIP trunking is one of the most cost effective ways for an enterprise to provide voice services
for their users.
• In an increasingly data networked environment, it offers enterprises the ability to use their
existing data network to offer both voice and data services; thereby simplifying and
consolidating the costs associated with maintenance and administration of two separate
networks.
• IPedge system is able to support SIP Trunking with routers that cannot support SIP ALG.

Requirements

• SIP trunking service – SIP trunking service needs to be purchased from a Toshiba certified SIP
trunk provider.
• Configure SIP trunking on IPedge node – SIP trunk parameters provided by the service
provider need to be configured within the IPedge administration interface in order to register
with and use the service.
• Within the Firewall and the NAT router the following ports and protocols need to be opened
and forwarded; in order for local end points to communicate and make calls via the SIP trunk
service:
• SIP – UDP 5060
• RTP/RTCP – Dynamically assigned
• When used behind a NAT firewall that does not support a SIP ALG, the IPedge system can still
be given a private IP address. The IPedge server will use it's internal Media Relay Server
(MRS) to route media packets between the WAN and the LAN to internally fix-up the NAT
translated IP address in the packets and the IPedge system will fix the SIP messages. Within the
NAT router, port forwarding rules will need to be configured, and a range or ports opened for
the Media Relay Server.
• When used with a NAT firewall that does support an enterprise grade SIP ALG (such as the
Cisco ASA5500 product line), the SIP ALG feature needs to be enabled. In this configuration,
the media packets will be routed directly from the LAN to the WAN and mid-call survivability
of a PSTN call is possible.

Interactions

Different SIP trunk providers have different configuration requirements to enable the service.
There are variations in requirements around registration, authentication, ports used, SRV records
etc. For details and references on configuring SIP trunk programming for these different
variations, refer to the IPedge Install Manual.
IPedge General Description 03/16
Networking
Toshiba's SIP Trunking I-VoIP Service
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