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New Member

confusion over srst

hi, I am new to this so please bear with me. We currently have a satellite office setup with an mgcp gateway where the pri is located at our main office. We want to add srst capabilities to this gateway which means I need an analog line ran to the router. My question is does the analog line have to go into an FXO or an FXS port on the router or could it go into either. Could someone please explain this to me.

Thanks

Linda

  • IP Telephony
1 ACCEPTED SOLUTION

Accepted Solutions

Re: confusion over srst

When you configure a directory number assigned to an IP phone there is a "Call Forward Unregistered" setting that allows CUCM to forward the call if the phone is not visible on the network as would be the case with a WAN failure between the offices.

If you assign the number assigned to the remote office FXO line as the Call Forward Unregistered destination then calls to that phone will be redirected over the PSTN to the remote office.

You have already identified the main issue with this in that only one call is supported per FXO line.

Please rate if helpful.

7 REPLIES
Hall of Fame Super Red

Re: confusion over srst

Hi Linda,

No worries :) In your example the Analog Trunk would term on an FXO Port;

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/vcallcon/ps2169/prod_qas0900aecd8028d113.html

Cisco Unified SRST System Administrator Guide

http://www.cisco.com/en/US/docs/voice_ip_comm/cusrst/admin/srst/configuration/guide/srstsa.html

Hope this helps!

Rob

"May your heart always be joyful And may your song always be sung May you stay forever young " - Dylan
New Member

Re: confusion over srst

Ok, that helped, but now I have two more questions. If we are only using one FXO port does this mean we only have one line to dial in/out on (I'm thinking like a home LAN line, if a call is on that line you cannot make another inbound or outbound call until that line is freed up). Also since our main company phone number is sitting on a PRI which is at a different site how will we get incoming calls if the WAN connectivity is broke? I see where on the FXO port I can configure an attendant DN and set it up for both ways. Is that how I would resolve this issue or would we not be able to recieve inbound calls until the WAN connection is restored?

Re: confusion over srst

As to FXO you're right no inbound or outbound call until that line is freed up.

As to PRI calls in case of WAN failure - you can reroute call using PSTN, so the call will be placed to your branch through FXO mentioned above. Just configure hunt group and hunt list and place that hunt list in the Route pattern that routes call to your branch gateway.

New Member

Re: confusion over srst

Ok, Thanks Guys for clearing that up!

Re: confusion over srst

When you configure a directory number assigned to an IP phone there is a "Call Forward Unregistered" setting that allows CUCM to forward the call if the phone is not visible on the network as would be the case with a WAN failure between the offices.

If you assign the number assigned to the remote office FXO line as the Call Forward Unregistered destination then calls to that phone will be redirected over the PSTN to the remote office.

You have already identified the main issue with this in that only one call is supported per FXO line.

Please rate if helpful.

New Member

Re: confusion over srst

Actually something just occurred to me about this. If our main PRI is at another location and the link between this location and ours was broke but the PRI was still up and functioning wouldn't the main number still work, but would just go to voicemail instead of ringing the phones if I didnt have a forward set on it?

thanks,

Linda

Re: confusion over srst

FXO is for Foreign Exchange Office.

FXS is for Foreign Exchange Station(end device like analog phone or fax)

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