Echo is also a sign of impedance mismatch on analog lines. I would use an H pad unless there is DC on the line. If so you will have to have a capacitor H pad. 5 resistors, one capacitors. Might start with 6 dB with a 2uF caps in series with the resistor across the line. http://www.nu9n.com/tpad-calculator.html
Use 600 ohms as the line impedance. A pad will also provide impedance matching to a certain extent. From: That One Guy /sarcasm Sent: Wednesday, January 18, 2017 12:42 PM To: [email protected] Subject: [AFMUG] turning down the "loudness" of incoming analog lines we have been working with fortinet on a customer who has been experiencing alot of echo from the sip PBX on the analog line, there is no direct control of the gain, they have provided multiple firmware releases lowering the gain to the point we achieved a tolerable number of echo instances. The refer to the issue as "loud" incoming analog lines. Is there a mechanism like a x-ohm resister on the tip or something to that effect to lower the volume or whatever the appropriate term is? our next step is to just get an ata to run the analog lines into to feed the pbx a controlled line, however im concerned this may just add another level of fuckery to the mix -- If you only see yourself as part of the team but you don't see your team as part of yourself you have already failed as part of the team.
