How to streaming audio with ffmpeg and container of my own choosing?

I’m streaming an ac3 audio via rtsp using ffmpeg like this:

> ffmpeg -re -f ac3 -i sample4.ac3 -ar 8000 -f mulaw -f rtsp rtsp://10.22.22.11:8554/audiostream

In the RTSP protocol exchange it DESCRIBEd like this:

> Session Description Protocol
>     Session Description Protocol Version (v): 0
>     Owner/Creator, Session Id (o): - 0 0 IN IP4 127.0.0.1
>     Session Name (s): No Name
>     Connection Information (c): IN IP4 0.0.0.0
>     Time Description, active time (t): 0 0
>     Media Description, name and address (m): audio 0 RTP/AVP 96
>     Media Attribute (a): control:rtsp://10.22.22.11:8554/audiostream/trackID=0
>     Media Attribute (a): rtpmap:96 mpeg4-generic/8000/2
>     Media Attribute (a): fmtp:96 config=1590; indexdeltalength=3; indexlength=3; mode=AAC-hbr; profile-level-id=1; sizelength=13;
> streamtype=5

I wondering if I can specify specific container in ffmpeg command line while keeping media format the same. For example I want MPEG-TS container instead of mpeg4. Looking through the ffmpeg docs did not really helped me.