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New Member

Compatibilité entre SPA112 et modem USRobotics 5637



Je n'arrive pas à faire fonctionner correctement mon Modem USRobotics 5637 et le SPA 112, en effet ce dernier nous sert à télécharger des informations d'une centrale d'alarme intrusion. Le modem compose bien mais lors de la prise de ligne il semblerai qu'il y ait un problème de dialogue.

Cela fonctionnait correctement avec une ligne analogique et le SPA112 fonctionne correctement avec un simple téléphone.

Y a til une programmation particulière du SPA112?


Everyone's tags (3)
VIP Gold

Compatibilité entre SPA112 et modem USRobotics 5637

I can't solve the problem, but I can give you some generic advices related to modem communication trougth SPA112. You need to use uncompressed codec (like aLaw), turn off echo canceller, RTP Packet size should be set to 10ms and Network jitter should be set as high as possible.

Your alarm central comminication speed should be set to 9600Baud (or lower) if configurable.

Then try it again.

New Member

bonjouravez vous réussi a


avez vous réussi a faire fonctionner votre modem avec le spa 112?


Pierre Pignoque

VIP Gold

Well, I arranged the

Well, I arranged the environment and tried (I configured the SPA112 as suggested above). Note the SPA112 has been connected to Internet using slow 2048/256kbps ADSL line. It has 200ms RTT - it's high somewhat for Voice.

Modem speed has been limited to 9600. It connected at V.32 9600 using V.42 error correction.

The connection is not so stable, it will survive few minutes only. It is much better on 1200 speed althougt the connection is not rock stable even on this speed. But remember my ADSL is very poor.

Even with such poor line it seems to be suitable for telemetry, alarm central and simmilar applications. It's not so good for remote terminal work.


Line 1 Status
Hook State:    OffRegistration State:    Registered
Last Registration At:    3/20/2014 21:52:25Next Registration In:    330 s
Message Waiting:    NoMapped SIP Port:     
Call Back Active:    No  
Last Called Number:    2501Last Caller Number:     
Call 1 State:    ConnectedCall 2 State:    Idle
Call 1 Tone:    NoneCall 2 Tone:    None
Call 1 Encoder:    G711aCall 2 Encoder:     
Call 1 Decoder:    G711aCall 2 Decoder:     
Call 1 FAX:    YesCall 2 FAX:     
Call 1 Type:    OutboundCall 2 Type:     
Call 1 Remote Hold:    NoCall 2 Remote Hold:     
Call 1 Callback:    NoCall 2 Callback:     
Call 1 Peer Name:     Call 2 Peer Name:     
Call 1 Peer Phone: