I am facing issue with my current setup. I am using CUCM be 3k with SPA8800, one PSTN line is terminating on the FXO line of SPA8800. and I am using an IP phone to use this line. I am able to see the caller id information on my cell phone if i dialed it from the IP phone. But when i recieved a call on the ip phone from outside, then it is showing "unknown number" as CLID.
Which version on BE3K are you on? 8.6.4? If not please do go to 8.6.4? Which country are you seeing this issue in. Typically in the US, the Caller ID is recieved in between the 2 and 3rd ring. The SPA 8800 waits 4 seconds to collect the caller ID. If the Caller ID is not recieved by then, then you will not see the caller ID.
The only way to find out whats happening is by looking at the traces. Could you please open a case on this and send us the case number?
First things first though - is CLI delivered to your PSTN line? This is not always the case. If you plug a typical analogue handset with a display in - do you see CLI on that for an incoming call?
If you do, then as Navin mantions, we'd need to take a closer look at what is happening on the SPA8800. If not, you may need to have this service enabled by your telephone provider.
Is this installation in India?
thanks for the information, I have already checked the same with analog handset and it is showing the CLID.
On the SPA8800 page, pl. check the value of PSTN pick up timer. If it is set to 0, please change it is to 4-5 sec.
Also, it will be good to upgrade to 8.6.4 build.