Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Fax Passthrough

Hello,

can i have the terminating gateway in g729 region and still use fax pass through considering that ata/fax switches to g711 with nse? Or does it cause any issues?

Thanks in advance.

2 REPLIES
Cisco Employee

Re: Fax Passthrough

Because NSEs are sent in the media stream without Unified CM even knowing about them, the switchover to G.711 from G.729 will occur. From Unified CM's perspective the call always stays G.729 since it has no visibility into the codec upspeed.

The main issue that you need to watch out for is the increase in bandwidth. Obviously G.711 consumes more bandwidth than G.729. if you have links where bandwidth is tight and they have been provisioned for a set number of G.729 calls then switching to G.711 can oversubscribe that link leading to voice quality issues. If you do not have this sort of scenario then you should be fine.

Regards,

David

New Member

Re: Fax Passthrough

Thanks for your reply!!

171
Views
5
Helpful
2
Replies