Система:
Trixbox 2.6 + Digium TE122 + SIP транк, ~70 шт. Grandstream GXP-1200 + GXP-2000
Кодеки: G.711
все работает, все норм

Вопрос:
можно ли настроить звуковое уведомление (сигнал) в линию при поступлении второго вызова?
в существующем варианте на GXP-1200 просто мигает красным "Line2", и когда оператору не видно телефонный аппарат - он не видит(не слышит) второй вызов.
копать в сторону * или Grandstream?

если такое вообще возможно, то как реализовать?
спасибо.

call waiting?

By default Trixbox сообщает звуковым сигналом. Если GXP-1200 отображает только миганием - надо смотреть настройки call waiting на нём самом.

/etc/amportal.conf
...
ENABLECW=yes
CWINUSEBUSY=yes

В конфиге Grandstream GXP-1200:

Call-Waiting Tone: f1=440,f2=440,c=25/525;
Disable Call-Waiting: no
Disable Call-Waiting Tone: no

После экспериментов:
call-waiting работает, тон слышно...НО еле-еле... можно сказать, совсем не слышно.
как можно увеличить громкость этого тона на gxp-1200?

Пропустил "большое" обновление Firmware для Grandstream-ов ))
====================================================================
GRANDSTREAM NETWORKS
Firmware Release Notes
Firmware Version 1.2.3.5
Name of Product BT200/GXP280/GXP1200/GXP2000/GXP2010/GXP2020
Date: March 16, 2010

Note: Firmware 1.1.6.x has major changes that can NOT be downgraded to 1.1.5.x
or any previous releases.

SUMMARY OF UPDATES
The main purpose of this release is improving voice quality and addressing stability issues observed in
previous releases.

CHANGES SINCE FIRMWARE RELEASE 1.2.2.26
BUG FIXES
• Fixed '<' '>' in display name of From or To header of a SIP request such as SUBSCRIBE or
INVITE causes GXP responses 400 Bad Request
• Fixed GXP1200 displays no line info after hold conference
• Fixed phone HTTP upgrade lasts too long
• Fixed Cseq of SIP INFO error after GXP sends out PRACK
• Fixed display name check problem
• Fixed GXP2020 does not have account 5/6 in EXT page
• Fixed GXP semi-attended transfer issue
• Fixed one way audio issue after receiving INVITE with two c lines in SDP
• Fixed LCD menu display error with “Disable Direct IP Calls”
• Fixed LCD display error
• Fixed phone crashes when doing Offhook Auto Dial
• Fixed LCD display issue after blind transfer
• Fixed wrong Timestamp in RTP Packet
• Fixed CallerID blocking removed after 302 redirect on GXP2020 with 1.2.1.4
• Fixed phone does not re-register after network down in certain network environment
• Fixed no MoH GXP to GXP via 3CX, but does hear MoH when GXP calls a non GS phone
• Fixed phone sends out INVITE with incorrect To-tag in the TO header
• Fixed phone fails to handle "Session Attribute (a): inactive" correctly
• Fixed phone Codec negotiation issue with 3-way conference
• Fixed phone comes back to conversation hears busy tone
• Fixed phone sends new INVITE with to-tag
• Fixed incorrect Event Duration
• Fixed regression on MSG Button when using a lengthy voicemail user ID
• Fixed call records of GXP2020 account6 saved to phonebook error
• Fixed phone cuts off the call if it receives NOTIFY with unsupported Event
• Fixed no event duration on RTP packets when pressing MultiPurpose Keys using SEND DTMF
RFC2833
• Fixed request in the same dialog does not include Route Headers from previous response
• Fixed GXP20xx phone Locks up and does not send out PRACK messages
GRANDSTREAM NETWORKS Release Notes for F/W 1.2.3.5 3/2010
• Fixed SDP response is wrong if iLBC payload type is 101
• Fixed after conversation for 10 hours, BT200 call time display is not correct
• Fixed phone sends inactive to resume the audio call if it is in remotely held state
• Fixed phone adds empty phonebook record automatically
• Fixed phone does not send SIP register to Broadsoft using STUN and SIP over TCP
• Fixed issue with processing big INVITE packets on TCP transport
• Fixed GXP eventlist BLF issue under certain condition: LED dos not change status when a
monitored phone receives calls
• Fixed GXP crashes after receiving long NOTIFY message for eventlist BLF
ENHANCEMENTS
• Updated bootloader to 1.1.6.8
• Added GXP-extend capability for customizable XML screen
• Added LCD Menu option to configure MPK
• Added web UI option for "Disable in-call DTMF display"
• Added support to load XML idle screen file on reboot for GXP20xx
• Changed registration renewal time to half of the expiration time
• Added support to hide "ForwardAll" softkey if call feature code is disabled
• Added support to use phonebook while offhook for GXP2010/2020
• Added support to use Speed Dial and Re-Dial for Direct IP Calls
• Added support for Signin automatically if there is only one callqueue
• Added web UI option "Use custom filename" for GXP2000 and GXP2010
• Modified BLF LED to flash when a monitored phone hears ring back tone under Broadsoft mode
• Added web UI option to enable/disable SIP instance ID
====================================================================

будем обновляться и смотреть!