the PSTN/ POTS module. Connecting a regular phone to the port 8 of the PSTN/ POTS on Atlas550 makes this phone reachable by the number
Step 5: Testing and Troubleshooting
R1 and R2 are CME capable routers. R1 is located at the main office and R2 is located at the remote office. The phones under R1 will register at R1 and the phones under R2 must register at R2.
Playing the role of main site, R1 has a PSTN connection as well. This connection is achieved through a PRI/T1 link and all the calls headed to the PSTN will be forwarded to this link. Incoming PSTN calls will arrive over this link too and R1 is able to forward them correctly.
The IP Phones are located at the user’s office where there is a PC. This PC may be using the IP Phone as the access switch and thus, to access the data network.
Try to place calls from one IP Phone to another, use the extension numbers showed on the IP Phone’s display. The calls should be successful completed.
Try to place calls from the IP Phones to the regular phone (dial 95556008 from the IP Phones) and from the regular phone to both IP Phones (dial 5555011 and 5555021 from the regular phone). All calls should be working fine. Troubleshoot if necessary.
When working with the Telephony Company Cloud and something doesn’t work, it is useful make sure the router is receiving the calls, that the Cloud is forwarding the calls well. If you can see the calls process on the router, it means the clouds is doing its job and the problem is probably the way the router is handling the incoming calls.
On this scenario, the connection with the company is simulated using an ISDN/T1 link which is very similar to a real world situation. A very useful command when working with an ISDN and PSTN is the debug isdn q931 command.
The show isdn status command can be used to make sure your ISDN connection is established. A common output of this command at R1 when the PRI/T1 ISDN link is established and up is similar to the following:
r1#sh isdn status
Global ISDN Switchtype =
dsl 0, interface ISDN Switchtype =
ACTIVE Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED Layer 3 Status:
0 Active Layer 3 Call(s) Active dsl 0 CCBs = 0
The Free Channel Mask: 0x807FFFFF Number of L2 Discards = 0, L2 Session ID = 5
149 - 165 IP Telephony v1.0 SBA Version 1: | Copyright ♥ 2005, Cisco Systems, Inc. |
