Need clarification with FXO-LS on MGCP gateway with CUCM operation

[Alexey Platov]

Hello gurus

I've searched this forum and I read excellent documents from Cisco (must read for everyone using FXO!)

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800ae2d1.shtml

http://www.cisco.com/en/US/products/hw/routers/ps274/products_tech_note09186a00800b53c7.shtml

I played with almost allsettings on my "voice-port 0/1/0".

But still did not find an answer to one question.

Here it is:

When incoming calls comes to FXO port is it ALWAYS answered (FXO goes off-hook) whatever further call distribution is - whether it will be answered by CUCM user or not? I mean that, e.g., if office is closed and nobody would answer this call then there is no need for FXO to answer this call - let it keeps ringing. Because if call is answered then accounting for calling user is also started from PTT.

Can somebody give me an answer - is it possible to configure FXO in such a way as to  answer a call only if CUCM user answers a call?

Thanks in advance,

[paolo bevilacqua]

Do not use MGCP, is has too many limitations and drawbacks.

With H.323 or SIP. everything will work correctly instead.

[Alexey Platov]

Do you mean if I change gateway prorocol to H.323 then FXO would "go off-hook" only in case CUCM user answers this incoming call?

Besides I read somewhere here "Use MGCP when you can. Use H.323 when you have to".

With MGP everything's working fine except that point of FXO going off-hook even the call would not be answered.

[paolo bevilacqua · Accepted solution]

Again: use H.323 with connection plar opx, and you will be fine.

[Alexey Platov]

Thanks. I changed to H323 gateway and It is working now right way.

[paolo bevilacqua]

You will also enjoy many more features, flexibility and ease of SRTS configuration now.

Thanks for the nice rating and good luck!