Tech

Hosted PBX and SIP-ALG

Published on:

April 2, 2014

In 5.2.2, we’re addressing a common challenge for SIP phones in LANs that need an outbound proxy based on their location. To provide the required quality of service, devices like Edgewater VoIP routers or even simpler routers route SIP traffic separately from other office data. To offer more flexibility, we’ve introduced a pattern-based list for specifying outbound proxies. This allows you to define specific IP addresses, ports, and transport types for different networks. For example, if a tenant has two offices with different network setups, the domain setting allows administrators to configure outbound proxies for each office using patterns like "1.2.3.4/32/10.0.0.2" or "10.43.0.0/24/edge43.company.com:5061/tls".

Another piece in the hosted PBX puzzle that we are addressing in 5.2.2 is that SIP phones in LAN often need an outbound proxy that depends on the location.

It is actually a scenario that makes sense. Using a local SIP-aware device is the ticket to providing a quality of service that is required by many offices. The device can be a full-blown device like an Edgewater VoIP router, but it can also be a trivial router that is just using another DSL line. The point is that the VoIP phones need to send their traffic to a specific IP address which will make sure that the traffic will be routed differently from the other data traffic in the office.

In order to offer maximum flexibility, we are introducing in 5.2.2 a list of patterns that looks like this: src/mask/adr[:port[/transport]]. If the phone to be provisioned matches the source address src with the netmask mask, it will use the outbound proxy made of the adr:port and transport parameters. The port and the transport are optional. If not present, they will be replaced with 5060 and udp.

The setting is a domain setting, so that in hosted environments customers can service themselves. The setting can be found in the PnP settings on the domain.

So let’s say that a tenant has two offices which have a VoIP router. The first office is at 1.2.3.4, and all traffic needs to be sent to 10.0.0.2. Then the first pattern would be “1.2.3.4/32/10.0.0.2”.

The second office would be in the VPN of the company and uses IP addresses 10.43.0.x, and the internal gateway is at edge43.company.com, using TLS on port 5061. Then the second pattern would be “10.43.0.0/24/edge43.company.com:5061/tls”. In the domain setting the administrator would have to enter “1.2.3.4/32/10.0.0.2 10.43.0.0/24/edge43.company.com:5061/tls”.

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