Cisco Systems manual External Users Calling the SPA9000

Chapter 4 Configuring SPA9000 Features

Basic Call Management

This example specifies the following:

•Lines 1 and 2 are allowed when the called number starts with 9

•Line 3 is allowed if the called number starts with 011852

•Line 4 is allowed if the number starts with *1800 followed by seven more digits.

One or more client station patterns can be specified in <Group x Line>, with each pattern separated by a comma. Each pattern may contain the “*” and “?” wildcards, or “%xx” escaped characters. For example:

<Group x Line> = 51*,56%2a*,577?

In this example, any number starts with 51 or 56*, and any four-digit number starting with 577 belongs to Group x.

Each line interface has a finite call capacity (maximum number of simultaneous calls allowed on the line), which is statically configured in the line <Call Capacity> parameter. When the maximum call capacity is reached, the SPA9000 does not allocate any more calls to that line interface.

Each line interface behaves as a Back-To-Back User Agent (B2BUA). Note the following:

•The INVITE sent to the ITSP carries a “ref” URI parameter in the FROM header that specifies which is the extension. Below is an example where the 5031 is the extension that originates the call to the external number 37683103.

INVITE sip:37683103@matrix.sipura.com SIP/2.0

Via: SIP/2.0/UDP 192.168.2.205:5060;branch=z9hG4bK-9ee9fbdd

From: PBX Line 1 <sip:37683101@matrix.sipura.com>;tag=4625e6e97e37072ao2;ref=5031

To: <sip:37683103@matrix.sipura.com>

Call-ID: bbcb4515-201f5eee@192.168.2.205

CSeq: 101 INVITE

Max-Forwards: 70

Contact: PBX Line 1 <sip:37683101@192.168.2.205:5060>...

•The default <Phone Dial Plan> for provisioning the client stations is: (9,[3469]11S09,<:1408>[2-9]xxxxxx9,<:1>[2-9]xxxxxxxxxS09,1[2-9]xxxxxxxxxS0

9,011xx.9,xx.[1-8]xxx)

This dial plan specifies to dial 9 to get an outside line. The <Dial Plan> of each line interface, on the other hand, is set to (<9:>xx.) which strips the leading digit 9 from the number dialed by the client station.

External Users Calling the SPA9000

When the SPA9000 receives an external incoming call to its line interfaces (Line 1, 2, 3, or 4), it consults the line <Contact List> to identify the client stations to alert. The <Contact List> parameter may contain one or more number patterns, with each pattern separated by a comma. Each pattern may contain the “*” and “?” wildcard or “%xx” escaped characters.

For example:

Line 1 <Contact List> = 531?,aa.

	Linksys SPA9000 Administrator Guide
Document Version 3.01		4-15