Volume gain for IP lines

[lebenton]

Is there a similar place like the FXS/FXO line Gain Control page for IP
lines on the Quadro? We have users reporting soft volume on the called
party side when the call is originated from the IP phones under Quadro.



The volume controls on the IP-Phones usually only adjusts the
speaker/handset (incoming) volume, but not the mic (outgoing) volume.

[threebit]

What kind of IP phones are you using?

[lebenton]

Linksys SPA-941

[threebit]

Ok, sorry I havn't used that phone.
Aastra phones have adjustable mics, but this can't be changed in the web interface, maybe the 941 is the same.

[davrays]

Hi Peter


no, there is no such place in Quadro. Quadro cannot affect the volume of the voice from IP Phone (when call is from IP Phone to external SIP destination) as it just passes audiothrough, without decoding that.


I think you will have the same problem, when just directly calling from that phone to the same IP destination (without Quadro).


Such thingsmight be configurable from IP Phone config file, even if they absent in phone's GUI.

[lebenton]

Thanks everyone for the replies.



I found the input gain control on the SPA-941 actually, I just had to change the GUI to Admin mode smileys/smiley17.gif. So I'm getting louder volumes on the receiving end now smileys/smiley4.gif.



Is that right that Quadro doesn't decode the calls originating from the IP-Phones?smileys/smiley3.gif
Thought since I'm making a IP-PSTN call via our ITSP, it'd be processed
by the Quadro irrespective of whether I'm using analogue or IP handsets.

[Sergio]

Is that right that Quadro doesn't decode the calls originating from the IP-Phones?smileys/smiley3.gif Thought since I'm making a IP-PSTN call via our ITSP, it'd be processed by the Quadro irrespective of whether I'm using analogue or IP handsets.



Sorry, but I cannot unsdestand here what you meanwith "decode"? As you know when the call is passed through the IP the analog voice always is encoded into digital siglan in shape of RTP packets. Thenthe ITSP decodes the bunch of packets into analog voice and passes it to PSTN line.


So, if you can make clear what "Quadro doesn't decode the calls" means that will help me to help you about the question smileys/smiley1.gif

[lebenton]

Sorry, but I cannot unsdestand here what you meanwith "decode"?...



Sergio,



I was using the same term as what davrays mentioned above






... Quadro cannot affect the volume of the voice from IP Phone (when call
is from IP Phone to external SIP destination) as it just passes
audiothrough, without decoding that.





Quadro users can use analogue or IP phones. In the context of making
IP-PSTN calls via ITSP (as calls to PSTN maybe different in discussion
below), from what I can interpret in davrays' post above, he is saying
that when you use an IP phone, the analogue voice is encoded into
digital signal by the IP phone. Therefore the Quadro does not need to
decode this digital signal, it simply passes the audio through. That's
why the Quadro can not affect the gain control. (And I guess implying
that since analogue voice coming from analogue phones are encoded by
the Quadro, that's why gain controls are available for the analogue
extensions, but not for IP extensions)



My question was more of a remark of what davrays has said. I thought
all calls, irrespective of what phone it originates from, would be
processed by the Quadro. But from what I can gather that depends on
what phone you are calling from (IP/Analogue), and where you are
calling to (PSTN/IP-PSTN/SIP).



Please correct me if I'm wrong?

[Sergio]

Please correct me if I'm wrong?



You are right, you grasp it correctly. When a call comes from an IP phone the voice already is encoded. You see, the call originated on the IP phone registered as an IP Line may pass three different ways through the Quadro:


1. to analog extension;


2. to PSTN;


3. to SIP destination.


With the first two cases the voice is decoded to pass the analog voice either to an analog phone or to PSTN. With the third case the voice packets just NATed and nothing happens with the RTP packets themselves.


Do you think there is need for the Quadro to decode/encode the voice from IP phones, which passes to a SIP destination?

[lebenton]

Do you think there is need for the Quadro to decode/encode the voice from IP phones, which passes to a SIP destination?



No I don't see the need. smileys/smiley1.gif



I guess that is why IP-PBX in general supports more IP-lines than they
do FXS lines, as the using IP-lines takes the loading off the IP-PBX.

[infomicro]

Hi,

I have been reading your discussion because I'm having the same issue that lebenton had but with IP Phones SPA-942. Just to confirm, the problem will be solved changing the input gain control in the phone GUI?

Also, I have configured (in the same Quadro) IP Lines attached to Linksys PAP2T(ATA) and there is no problem with those extensions... How the coding-decoding works in that case? It is performed by the ATA?

[infomicro]

Hi it's me again,

lebenton, exactly which input gain parameter did you changed in the IP Phone?.... i'm asking because there is Handset input gain, Headset input gain and Speakerphone input gain, it seems like any of these can help to increase the volume of the mic (I have not proven it yet) and make the person at the other end to listen louder.