44: Configuring ISDN pseudowire
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© Virtual Access 2018
GW6600 Series User manual
Issue: 1.7
Page 507 of 519
44.2
Pseudowire functionality
Two packages are used to control the ISDN to SIP/RTP conversion: LCR and Asterisk.
Package
Sections
lcr
main
asterisk
export
LCR acts as a channel driver and allows asterisk to access the ISDN hardware.
Asterisk then sends SIP messages to the provider to establish communications channels
and forwards the data content of active ISDN B channels over RTP.
The router has an automatic clock recovery feature to allow the BRI interface to
effectively run at the same clock rate as the provider.
44.3
ISDN pseudowire in client role
The most typical scenario for the GW6610V-F-ISDN is for it to act in a client role
whereby locally attached ISDN equipment can make and receive calls on a remote ISDN
network over an IP network, typically via the ADSL interface on the GW6610V-F-ISDN
router.
In the example below it is assumed the routers involved have the following attributes:
•
GW6610V-F-ISDN client has two MSNs (Multiple Subscriber Numbers): 384720
and 384721
•
A provider exists at 10.1.23.15
44.3.1
Configuring LCR for ISDN pseudowire in a client role
You only need to configure LCR with the MSN of the user equipment connected to the
BRI interface on the router. Most ISDN user equipment supports two or more MSNs.
LCR configuration files are stored on: /etc/config/lcr
root@VA_router:~# uci export lcr
package lcr
config lcr 'main'
option enable '1'
list msn '384720'
list msn '384721'