NAT

```

Nice to meet you.
We are making a mobile healthcare app and we are seeking an audio/video
solution.I found Imsdroid on Google code.
This is a very good project, very powerful. We use opensips and Asterisk build
two sip servers ,sign in LAN,
audio and video calls both are no problem.There exits some problems when link
in the WAN.
1.It can register when use both sip servers,but you can not make audio and
video calls use the sip server Opensips.Request time out.
2.Sometimes using Asterisk can receive audio and video calls, but you can not
call the other phone. Transport error reported .
3.Later we found sipdroid, it can call imsdroid.&n
bsp;But imsdroid can not call sipdroid. Transport error reported
Pls confirm above and tell us whether we can achieve these, thank you very much.
Any questions pls contact me.
Here are the log pictures

```

Original issue reported on code.google.com by `hlxh...@gmail.com` on 18 Dec 2013 at 10:20

Attachments:
- [ATT00004.png](https://storage.googleapis.com/google-code-attachments/imsdroid/issue-498/comment-0/ATT00004.png)

No source file, test, or entry point is named. Start by reviewing the attached log image and reproducing the three reported WAN scenarios involving OpenSIPS, Asterisk, and Sipdroid; done would require identifying whether the registration, call, and transport failures are reproducible and documenting their cause or resolution.

Written by the indexing model from the issue text.