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

SPA3102 + FAX

Hello!

   I have one SPA3102 with its FXS connected to a PBX and FXO to POTS. If I send one fax from PBX side the call seems connect with remote side but after some secons the operation fails. Outgoing fax are sent from FXS to FXO directly via dialplan. All works ok without connect SPA. Must I change any param from standard params? It has CED and CNG detection on. I am from Spain.

Regards

Everyone's tags (2)
8 REPLIES
Cisco Employee

Re: SPA3102 + FAX

Dear Sir;

This is not normal at all, as this is a normal loop. Please try the following: increase the gain on the FXS side (both input and output) and try again. Typically PBXs derives less signal or are less sensitive than PSTN or short loops.

Regards
Alberto

New Member

Re: SPA3102 + FAX

I think it is not a gain problem because I have echo. I've spent a lot of time trying make it dissapear but it was impossible. I have a lot of doubs about how SPA3102 treats one call:

- How can I know if a echo problem in a call from FXS to FXO (or FXO to FXS) refers to FXS gain or FXO gain config value?
- How exactly FXS input gain affects one of those calls?
- How exactly FXS output gain affects one of those calls?
- How exactly SPA to PSTN gain affects one of those calls?
- How exactly PSTN to SPA gain affects one of those calls?
- Could FXO and/or FXS impedance have any influence on echo?
- Which would be good values of impedance for Spanish telcos? Is there any way to know which is the best value to use?

- Regarding SPA echo cancel capabilities, What is the differente between Echo Canc Enable, Echo Canc Adapt Enable and Echo Supp Enable? How the affect to echo cancel of SPA? If I set to yes those three values I cannot send faxes correctly.

Is there any guidelines to follow when echo appears? Is there any tech document explaining all these config values fully explained?

Sorry for asking so many questions but I've trying to make work SPA for hours without success.

UPDATE:

Tested also with a SIP to PSTN call having the same echo problem. Configuring SPA with another PSTN line from another telco I get the same result. Always I hear my voice echoed...

Cisco Employee

Re: SPA3102 + FAX

What about the impedance? Do you have it set to the country impedance?

Regards
Alberto

New Member

Re: SPA3102 + FAX

I tested all possible impedances without success. I read usual impedances for Spain are 600r and 900r. May be a 5.1.10 firmware bug?

Regards

Cisco Employee

Re: SPA3102 + FAX

Dear Sir;

Please try 5.1.7. My suggestion (if possible) is that you downgrade, perform a factory reset and reconfigure. Let me know the results.

Regards
Alberto

New Member

Re: SPA3102 + FAX

Where can I download 5.1.7 (an others) version?

Regards

Cisco Employee

Re: SPA3102 + FAX

www.cisco.com download software area. Just type SPA3102 on the search function.

Regards
Alberto

New Member

Re: SPA3102 + FAX

Same echo problems once donwgraded to v5.1.7 Any other idea?

Regards

1512
Views
0
Helpful
8
Replies