Re: [Linphone-developers] error while connecting to ISDN

[Joerg Bergmann]

Hello,

the codecs as listed in that paper are nonsense for ISDN. See
http://de.wikipedia.org/wiki/Integrated_Services_Digital_Network
For ISDN, the only used speach codec is G.711/A-law/PCMA
(PCMU in north america).

Joerg

Am 07.10.2009 21:56, schrieb Jorma Karvonen:
> Hello,
>
> Some help could be found here: http://www.isdnaudio.com/isdnguide.html
>
> Br,
>
> Jorma K.
>
> 2009/10/7 Joerg Bergmann <address@hidden <mailto:address@hidden>>
>
>     Hello,
>
>     while connecting to a german ISDN phone, I had to disable
>     all codecs except PCMA and PCMU. Otherwise, the ISDN phone
>     wasn't able to hear me. Maybe that's an error in codec
>     negotiation in linphone; the ISDN phone may give no answer
>     at all and linphone has to use PCMA? PBX was sipgate.de
>     <http://sipgate.de>.
>
>     Joerg
>
>
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