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SIP-T21P - No audio if SRTP used, also, and no spanish web UI
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jcvh Offline
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Posts: 14
Joined: Nov 2013
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Post: #1
SIP-T21P - No audio if SRTP used, also, and no spanish web UI
Hello everybody!

Recently, our local provider announced it will no longer distribute SIP-T20P phones, but now will sell SIP-T21P.

I have one now, and i am testing its capabilities, so it can be used in our deployments.

So far, i have stumbled into two issues, first, the less important:

1.- No Spanish Web GUI:
I just copied the T20P working template, wich have:

lang.gui = Spanish
lang.wui = Spanish

The web UI doesn´t seem to have a spanish translation, so it gets set into Chinese. Is there any chance that the spanish translation would be included in the future?

Now the important:
2.- No Audio if SRTP is used:
I can get it to register, and everything works fine when the transport used is UDP. I even can set the transport to TLS, and it registers fine, but as long as i try to use SRTP, it kind of loses its audio.
- The calls are completed, but there is no audio in any way
(i am behind several NATs, but i have a T26P with the exact same config working just fine). A packet capture shows no SRTP packets coming out from the phone.
- When i dial, the phone dont even give me ring back tone, it simply goes mute, probably because the RBT comes in band.
- While making outgoing calls (from the T21P), it simply doesn't have audio, if i try a call towards the T21P, the first time it rings OK, but if answered, besides not having audio, after hangup,
the phone don't even give me dial tone when off-hook anymore, not in the handset, nor throu speaker if the speaker or line button pressed. Even more, it DOESN'T RINGS anymore. It kind of loses all audio capacities, and stays like this, even after disabling SRTP. It only normalizes if power cycled, but the no in call audio issue persists.

Besides all that, i noted that aparently there is no configuration for the LAN port mode in the web UI, nor in the phone itself. I read somewhere that the new default is to be set as "router", wich is of no use for our deployments. I sucessfully used the autoprovisioning files to set it in bridge mode. Is weird not having access to that settings in any other way, tho.

Well, i'll be waiting for any comments, thanks in advance, and regards!

09-24-2014 03:29 AM
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SIP-T21P - No audio if SRTP used, also, and no spanish web UI - jcvh - 09-24-2014 03:29 AM

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