[pmef]

Hi,

I am trying to use SIP over wifi on an N900.

If I try calling someone from an N900, I can hear that person correctly. However, that person is unable to hear what I say. The quality varies from very choppy to completely inaudible.

- Tried different SIP servers with different providers.

- Tried rebooting the N900

- Tried different wifi networks on different internet connections (both are broadband and have other sip phones working well on them)

- Tried different wifi security types (WPA2, WEP, none)

Any idea how to fix this?

Thanks.

[pmef]

More info:

Tried disabling wifi power saving

Tried high and low transmission power

Same symptoms...

[Bao_]

It is because N900 send very big G711 frames with 40ms packetization. Not all devices can handle G711 with 40ms.

Anybody know how to limit G711 packetization on N900?

[cpitchford]

Out of interest, does it perform better with a consistent noise source.. ie playing a music track?

[ocrete]

Since PR1.2, we respect the a=ptime and a=maxptime properties in the SDP. If you're server needs a specific ptime (or maximum ptime) and does not specify it, it's a bug in the server.

[SimonGie]

I have the exact same problem, but with Skype and the audio coming through is so bad I just don't use Skype anymore.

This is over 3G and wifi, with Titan and stock kernel.