...
At the time of writing, we have discovered an issue which only arises under very specific cirumstances. When the issue occurs, a call placed on hold cannot be retrieved from hold. The issue only occurs in the case where all the following are true:
- Handset of the caller is configured to use a vlan
- Handset of the called party is configured to send DTMF tones via RTP (RFC2833). Unfortunately, this is the only supported, and thus default, option for SipXecs provisioned handsets.
- The caller is the person to put the call on hold. The issue does not occur if the called party puts the call on hold.
...
A utility called 'gsutil' can be used to dump a plaintext decoded version of the configuration from the handsets. This utility is available from http://www.pkts.ca/gsutil.shtml. This can be particularly handy when trying to compare configurations.
Ringtone
The default ringtone for the handset is terrible, as it sounds like a loud standard 'ringback' tone, so when a call is coming in, it sounds like a call has been dialled in handsfree mode, and the speakerphone is plaing the ringback tone. Thankfully, the other ringtones (there are 3 by default) sound more like traditional ringing tones.
Grandstream has a very neat downloadable ringtone, which rings once, then announces, via text to speech, the number of the incoming call. We've found this to be very handy when we're meeting just outside our office, and a call comes in, we can listen to see who is calling without running to look. Effectively, the most distinctive ringtone possible. Very slick.
Configuration screens
The following are screen captures of handsets setup in our environment, in which most features seem to be working.
