System information

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System Administration Guide

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Revised: March 28, 2007

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Proxy is an Enterprise Server – This is an advanced feature that allows interfacing to external SIP proxy

services that actually have dial plan knowledge of your local site, but in most cases this feature is not used.

See the Enterprise Dialing Feature section later in this chapter for more information.

Default Auto Attendant

– Select the auto-attendant that should be used when inbound calls from this Proxy

are routed to an Auto Attendant.

Call Routing

– This selection determines how calls received from this proxy are routed inbound to the Allworx

server. This is identical to the manner how all outside lines are configured including analog phone lines and

digital lines.

7.2.1.1 Advanced Settings

The specifics of what values to enter for each of the Advanced Settings parameters vary with different ITSP’s.

Consult with your ITSP for this information.

DTMF Payload – This value is used as the assumed DTMF payload for inbound calls that do not include the

RFC 2833 DTMF negotiation. Typically this is set to 96 or 101.

Pad DTMF RTP Packets

– DTMF RTP packets are typically smaller than 64 bytes. Some switches and

routers will discard any UDP packets shorter than 64 bytes. When this box is checked the Allworx will pad the

DTMF packet by expanding the RTP header to make the packet at least 64 bytes long. Typically this

checkbox is not checked.

Enable Early Media

– Some service providers send audio before an outbound call has been answered (using

183 Session Progress in SIP). This can be used to relay announcements (e.g. "Your call can not be

completed as dialed”) or remote ring back tones. When this checkbox is checked, the Allworx will present the

audio to the caller when received. When this checkbox is not checked, the Allworx will ignore the early audio

and generate a ring back tone internally. Typically this checkbox is checked.

Supports Symmetric Response Routing

– Some service providers assist the remote end in NAT traversal by

supporting RFC 3581 Symmetric Response Routing. When this checkbox is checked, a remote handset

behind a NAT firewall will assume the service provider can correctly detect the audio port to send traffic to.

When this checkbox is not checked, the handset needs to be port-forwarded through the NAT firewall, or

must use the Allworx for proxying of audio traffic (see Servers / VoIP Server). Typically this checkbox is not

checked.

Supports SIP REFER

– This selects the method of transferring calls between multiple remote end-points

through the service provider. When this checkbox is checked, SIP REFER is sent to the service provider to

allow them to connect the two end-points within their network without intervention by the Allworx. When this

checkbox is not checked, the Allworx will act as a proxy between the two remote ends of the calls. Typically

this checkbox is checked.

Supports SIP Redirect – This selects the method of redirecting inbound calls that are forwarded back to the

service provider without being answered (e.g. all calls are forwarded to a cell phone). If this checkbox is

checked, a SIP 300 redirect message is sent. If this checkbox is not checked, the Allworx will negotiate the

call setup for the service provider. Typically this checkbox is not checked.

Obtain DID number from [source]

– This defines the SIP header to extract the DID number from for inbound

calls from the service provider that are routed to a DID block,. Typically this is set to [SIP To: header field].

Use [source] in Request URI of outbound calls

– This defines the username parameter of the SIP Request

URI for outbound calls to the service provider. Most service providers expect to have the requested number

or ID [dialed number] in this field, but some require the registered account information [address of record].

Typically this is set to [dialed number].