Cannot find MSRP session

```
a) Before posting your issue you MUST answer to the questions otherwise it
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b) Please check the issue tacker to avoid duplication
c) Please provide network capture (wireshark) or Android log (DDMS output)
if you want quick response

What steps will reproduce the problem?

1.Share content from Audio/Video call screen (ScreenAV.java).

What is the expected output? What do you see instead?

File sharing is not done between two two devices and between two AVDS.
Instead of that i get error in Log cat as

E/org.doubango.imsdroid.Screens.ScreenFileTransferView(335): Cannot find MSRP
session with id=29

I successfully done Audio and Video call in both devices and AVDS(Android
Virtual Devices).
But Do not able to do File transfer.OR generate MSRP session.

For MSRP which fields i want to change in Options(Setting).
I follow steps as per below link.
http://code.google.com/p/imsdroid/wiki/sip2sip_info

What version of the product are you using? On what operating system?

I use SIP accounts of sip2sip.info
IMSDroid version=2.0.484
doubango_revision=687
NGN version=2.0

Please provide any additional information below.

What thing I missing to get File Transfer and Chat to work in IMSDroid?
Please guide me to solve this issue.

```

Original issue reported on code.google.com by `android....@gmail.com` on 24 Apr 2012 at 8:28

Start by reproducing file sharing from the Audio/Video call screen described in ScreenAV.java using the reported IMSDroid, doubango and NGN versions, and capture the Logcat or Wireshark output requested in the issue. Inspect the MSRP-related flow around ScreenFileTransferView and the reported missing session id; done means file transfer works between the stated devices or the failure is narrowed to a documented cause.

Written by the indexing model from the issue text.