# Unable to set remote answer on Android (Flutter)
**URL:** https://mediasoup.discourse.group/t/unable-to-set-remote-answer-on-android-flutter/565
**Category:** mediasoup libraries
**Created:** [February 9, 2020, 11:25am UTC](https://mediasoup.discourse.group/t/unable-to-set-remote-answer-on-android-flutter/565 "2020-02-09T11:25:09Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@yonatann](https://mediasoup.discourse.group/u/yonatann)
#### Post date: [February 9, 2020, 11:25am UTC](https://mediasoup.discourse.group/t/unable-to-set-remote-answer-on-android-flutter/565/1 "2020-02-09T11:25:09Z")
Hi,
I am building a flutter app that will connect to a mediasoup server.
I am getting the following error when trying to produce an audio stream:
Failed to set remote answer sdp: Failed to set remote audio description send parameters.
See below the offer and answer sdp.
Any help would be much appreciated.
Cheers,
Yonatan
Offer:
v=0
o=- 5877506085759590400 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio
a=msid-semantic: WMS
m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 102 0 8 106 105 13 110 112 113 126
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:PV0d
a=ice-pwd:q98Z4y4llyjg4smZvNPzz90i
a=ice-options:trickle renomination
a=fingerprint:sha-256 BA:26:2B:12:75:4D:5E:EF:66:35:0F:0A:A6:1B:88:94:D3:83:31:5D:24:E4:50:1D:09:6F:EA:6C:36:14:71:0C
a=setup:actpass
a=mid:audio
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:2 [http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01](http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01)
a=recvonly
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=rtcp-fb:111 transport-cc
a=fmtp:111 minptime=10;useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
a=rtpmap:102 ILBC/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:110 telephone-event/48000
a=rtpmap:112 telephone-event/32000
a=rtpmap:113 telephone-event/16000
a=rtpmap:126 telephone-event/8000
Answer:
v=0
o=mediasoup-client 10000 1 IN IP4 0.0.0.0
s=-
t=0 0
a=ice-lite
a=fingerprint:sha-512 9A:52:B3:8B:9B:CC:32:2A:45:9E:73:4A:BE:1E:43:39:AD:A1:B3:43:53:F0:3D:DB:2F:1E:C1:91:14:D9:EA:3D:40:A0:4E:C4:6F:B1:46:28:A7:B2:41:78:BD:5C:EE:0E:25:34:B3:C3:09:BC:06:C2:A8:D8:C7:9C:E3:6A:A8:22
a=msid-semantic: WMS \*
a=group:BUNDLE audio
m=audio 7 UDP/TLS/RTP/SAVPF
c=IN IP4 127.0.0.1
a=extmap:2 [http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01](http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01)
a=mid:audio
a=recvonly
a=ice-ufrag:2ed3ax7wqk29a70n
a=ice-pwd:n7y0b6w5jx3erwlk8wvxorxqoycnoha9
a=candidate:udpcandidate 1 udp 1076302079 0.0.0.0 42643 typ host
a=end-of-candidates
a=ice-options:renomination
a=rtcp-mux
a=rtcp-rsize
---
### Author:  [@ibc](https://mediasoup.discourse.group/u/ibc)
#### Post date: [February 11, 2020, 9:59am UTC](https://mediasoup.discourse.group/t/unable-to-set-remote-answer-on-android-flutter/565/2 "2020-02-11T09:59:06Z")
No idea what Flutter is. Does it use react-native? If so ensure you are using the latest version of react-native-webrtc dep.
---
### Author:  [@yonatann](https://mediasoup.discourse.group/u/yonatann)
#### Post date: [February 11, 2020, 11:32am UTC](https://mediasoup.discourse.group/t/unable-to-set-remote-answer-on-android-flutter/565/3 "2020-02-11T11:32:05Z")
Hi,
Flutter is the next generation mobile development platform from google.
It is rapidly growing and provides a clean cross platform development experience.
> **[Flutter - Beautiful native apps in record time](https://flutter.dev/)**
>
> Flutter is Google's UI toolkit for crafting beautiful, natively compiled applications for mobile, web, and desktop from a single codebase. Flutter works with existing code, is used by developers and organizations around the world, and is free and...
The code is written in Dart so the react native libraries will not work.
I have made more progress by now and I am starting to translate all the SDP transformations + Device and Transport concepts from javascript to Dart…
I believe that a mediasoup plugin for dart will be super useful and I will try to package my code once it is working.
I will keep you updated
---
### Author:  [@ibc](https://mediasoup.discourse.group/u/ibc)
#### Post date: [February 11, 2020, 11:38am UTC](https://mediasoup.discourse.group/t/unable-to-set-remote-answer-on-android-flutter/565/4 "2020-02-11T11:38:06Z")
Nice. So it would be like a `mediasoup-cient` version written in Dart, right?
---
### Author:  [@yonatann](https://mediasoup.discourse.group/u/yonatann)
#### Post date: [February 11, 2020, 12:50pm UTC](https://mediasoup.discourse.group/t/unable-to-set-remote-answer-on-android-flutter/565/5 "2020-02-11T12:50:50Z")
Yes exactly