# Problem with analog phone

**URL:** <https://community.asterisk.org/t/problem-with-analog-phone/40374>\
**Category:** Asterisk Support\
**Created:** [September 7, 2012, 2:08pm UTC](https://community.asterisk.org/t/problem-with-analog-phone/40374 "2012-09-07T14:08:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![system](https://global.discourse-cdn.com/asterisk/original/2X/4/475d0c889911cfb84ac4881ad6df8b523e3f9105.png) [@system](https://community.asterisk.org/u/system)\
**Post date:** [September 7, 2012, 2:08pm UTC](https://community.asterisk.org/t/problem-with-analog-phone/40374/1 "2012-09-07T14:08:19Z")

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Hi all,

We have an Asterisk (Elastix) working fine since more than a year ago. We have a AEX410 board with 3 spans, 1-2 are FXS and 3 is FXO.

1-2 Spans are connected to our telephony carrier. We have 2 SIP phones and various people using softphones too. Everythinh works ok and as expected, call between SIP extension and outside in both directions work like a charm.

The analog phone has been disconnected for some months and I reconnected it today again. I’m having 2 problems with it:

- DTMFs recognition fails sometimes. I managed this to work ok using relaxdtmf=yes in dahdi-channels.conf.

- When calling outbound via trunk lines, analog phone seems to enter a loop. Call is being done correctly, ie my mobile phone rings and I can take the call, but in the analog phone end I only get loop-like noise. It works OK if I call a SIP extension, or if a SIP extension calls the analog phone, even if a SIP extension transfers an inbound call from our carrier to the analog phone.

Any clue what’s going on?

Thanks a lot  
Eneko