# \[Hilo\] Why Automatic Call Answer(ATS0=2) not work in MUX?

**URL:** <https://forum.sierrawireless.com/t/hilo-why-automatic-call-answer-ats0-2-not-work-in-mux/6480>\
**Category:** HL Series FAQ\
**Created:** [July 18, 2013, 8:39am UTC](https://forum.sierrawireless.com/t/hilo-why-automatic-call-answer-ats0-2-not-work-in-mux/6480 "2013-07-18T08:39:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![FAQ\_Poster](https://avatars.discourse-cdn.com/v4/letter/f/f9ae1b/32.png) [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\
**Post date:** [July 18, 2013, 8:39am UTC](https://forum.sierrawireless.com/t/hilo-why-automatic-call-answer-ats0-2-not-work-in-mux/6480/1 "2013-07-18T08:39:13Z")

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[Hilo] Why Automatic Call Answering (ATS0=2) not work in MUX with my Hilo?

Answer: To make auto-answering work in MUX mode, you need to send \<ATS0=1\> in the first data channel that is opened.

Below are 2 examples.

1. If the instructions are:

- AT+CMUX=…
- Establish control channel (DLC 0);
- Open DLC 1;
- Open DLC 2;
- Please send “ATS0=1” in DLC 1;

1. If the instructions are:

- AT+CMUX=…
- Establish control channel (DLC 0);
- Open DLC 2;
- Open DLC 1;
- Please send “ATS0=1” in DLC 2;