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148 posts

Master Geek

Topic # 95133 28-Dec-2011 23:43

Hey Guys, hoping I can have some help with a long-time issue with our VOIP setup at home and trying to get consistent Call Waiting performance. WAF is pretty low right now!



-Vodafone Naked DSL

-2Talk with one local 09 number and one 028 number



-Uniden xdect 8015 cordless handset on local 09#

-Basic Corded Telephone from the Warehouse on 028#

-SPA2102 ATA bridged (v5.2.12)

-TP-Link WR1043ND router

-Vodafone HG556a bridged (modem only)


Issue: (Party A is our 09#)

-Party A calls Party B, or receives call from Party B

-Party C calls Party A, ringing noise is heard by Party C

-Party A receives CWT tone correctly, and after approx. 2s, the CWCID chirp notifies that the CID data has been received

-Party A can still hear Party B before the chirp, but Party B cannot hear Party A (understood to be normal)

-Party A presses flash button, connects to Party C, sometimes putting Party B onto hold, sometimes disconnecting them. If on hold, Party B hears music.

-Party A presses flash button again to return to Party B, but only hears the dial tone – repeated presses still hears dial tone. Party C hears music. Party B, if on hold, hears music.

Party A has no calls connected, and Party B and Party C are still left listening to hold music, waiting for A to return

-New calls from Party A to B or C are met with engaged/busy tone

-Sometimes, Party A is able to reconnect with Party B, and then again to Party C, and then again to Party B, and so on, but at one stage, the dial tone will sound, and B and C are stuck in the PSTN somewhere (or wherever they are). There is no predictability to the results of immediate and successive tests


This issue has been happening since we were set up with 2talk mid 2011. Originally, the ATA was bridged with just the HG556a as a modem/router, and we were using an old Uniden cordless phone that didn’t support CWCID which was disabled, and still worked as described above.


I have tried scouring the web to look for ideal hook-flash timer settings, and the consensus seems to be 60ms-200ms, but it doesn’t appear that changing the hookflash has much effect on consistency of my experience. I have changed these values a lot. If anyone has any information about exactly the role of these min and max values, that would be great too.


Are there any other settings or configurations that need to be considered when trying to get solid Call-Waiting performance?  Do I need to look at the modem and ADSL stats? Could I expect to find these errors in the ATA logs, and/or is this something likely to be with ADSL or VOIP provider? QOS wouldn’t be a huge requirement since our network is very quiet.


I have included my key settings below, and would appreciate it greatly if someone could offer any advice!!


Thanks heaps!





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27579 posts

Uber Geek
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Biddle Corp
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  Reply # 562333 29-Dec-2011 07:02
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NZ Telepermit requirements for hookflash (recall) settings need to be between between 300ms and 800ms, ideally somewhere in the vicinity of 500ms-650ms.

148 posts

Master Geek

  Reply # 562355 29-Dec-2011 08:37

Thanks heaps for this.

However, I have tested a few times this morning with .3 and .8, and then also with .5 and .65, however, Party B gets dead air with these settings, and while Party C's call is answered, Party A cannot go back to Party B, and leaves both Party B and C connected.

I assume also that I am able to test these settings immediately after pressing Submit All CHanges and waiting for the ATA to reset?


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Biddle Corp
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  Reply # 562360 29-Dec-2011 08:45
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Could be a number of things.. I've never encountered those issues either on my network or other VoIP providers I use on a daily basis but since I don't use 2talk I can't answer for them, they would clearly be the best to contact.

148 posts

Master Geek

  Reply # 562361 29-Dec-2011 08:46

No worries - Thanks again!

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Biddle Corp
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  Reply # 562451 29-Dec-2011 13:59
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Hookswitch in the VoIP world can be a major problem as there are many ways of handing call holds etc.

This requires the ATA to send the correct SIP messages when calls are on hold etc - it's not just a simple matter of having the correct hookflash time settings in your ATA.

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Uber Geek
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  Reply # 562478 29-Dec-2011 14:39
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sbiddle: Hookswitch in the VoIP world can be a major problem as there are many ways of handing call holds etc.

This requires the ATA to send the correct SIP messages when calls are on hold etc - it's not just a simple matter of having the correct hookflash time settings in your ATA.

You don't say Wink 



Antonios K


Click to see full size

148 posts

Master Geek

  Reply # 562483 29-Dec-2011 14:49

The software version of the ATA doesn't have the recommended impedance value you recommend, so I have settled with the 600.

You have stated previously that it shouldn't be so much of an issue for analogue and ATA, but could hookflash messages be incorrectly sent?

148 posts

Master Geek

  Reply # 562774 30-Dec-2011 08:27

This is just an update to say this is no longer an issue after some changes I made last night.

I logged a ticket with 2Talk yesterday but hadn't heard anything late last night (or this morning), and looked around external information about 2Talk (not on their website).

I found a post on their Facebook account saying they had an auto-provisioning service now for the SPA2102, (Device Provisioning in 2Talk Live) and configured it to provision my ATA.

After testing this morning it is working fine.

The changes that were made are detailed below:

Sip port from 5060 to 50600
Proxy from to
Register expires from 600 to 300
FXS port impedance from 600 to 220 + 820||120nF
Various changes to CWT Cadence as per pic below

I'm not prepared to make any changes to see which change broke it, and I'm still not entirely sure whether this means I have been moved to the "2Talk+ beta", or whether this is just a proxy change.

Thanks heaps sbiddle for your help!

493 posts

Ultimate Geek
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  Reply # 562845 30-Dec-2011 12:11
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Going by the settings section for 2talk+ you are on that platform and very interesting about settings changes you have posted too.

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