Click Here To Visit SIP Broker  

Go Back   Voxalot / SIP Broker Support Forums > SIP Broker Forums > SIP Broker Support

SIP Broker Support Support for the SIP Broker service.

Thread Tools Display Modes
Unread 01-13-2010, 07:06 PM   #1
Junior Member
Join Date: Jan 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
rogerhilary is on a distinguished road
Default One way audio but only with some PSTN numbers

Any help appreciated.
I have a consistent problem with one way audio, outbound from me is fine, but inbound to the PAP2 there is no audio received, however this problem only occurs with some Sipbroker PSTN access numbers.
I am using a PAP2 connected to a Netgear MBR624GU 3G router. The PAP2 is registered to Callcentric. Echo test works OK and I have received a inbound SIP call with good two way audio.
I am not using STUN (syslog reports that I am using a symmetrical NAT)
I have the other line of the PAP2 registered with Sipdiscount and all works well including a UK DID number which allows incming calls from the PSTN.

The problem I experience is that using Sipbrokers PSTN access numbers on the callcentric registered line for some of the numbers there is one way audio whereas for others all is OK with good 2 way audio. I do not understand how this can be as I thought that on a call from a PSTN into a Sipbroker number that Sipbroker would then just pass the call onto Callcentric.
The problem is entirely repeatable
The ones I have tried which al;ways have the one way audio (no audio inbound to the PAP2) are:
All 7 of the listed Australian numbers -(Voxbone and Pennytel)
Both Auckland (NZ) numbers - (DIDWW and Callcentric)
A Boston (USA) number -Callcentric
An Oxford (UK) number - DIDWW

Whereas the following always have good two way audio:
An Oxford (UK) number - VOIPtalk
A Manchester number - VOIPtalk
A London (UK) number - Telappliant

A theme which has emerged is that all the one way audio ones have the male greeting on connecting to the Sipbroker PSTN number whereas all the 2 way ones have a different greeting (female)
So is there some difference in the boxes being used at the Sipbroker hosts?

What I am trying to acheive is a shared DID facility reacheable from an Australian number
rogerhilary is offline   Reply With Quote
Unread 01-13-2010, 09:58 PM   #2
Join Date: Feb 2006
Posts: 2,930
Thanks: 528
Thanked 646 Times in 340 Posts
martin is a jewel in the roughmartin is a jewel in the roughmartin is a jewel in the roughmartin is a jewel in the roughmartin is a jewel in the roughmartin is a jewel in the rough

Some of the DIDs re invite the SIP session to optimize audio. Based on your symptoms I suspect this renegotiation is causing problems for your ATA.

I am not familiar with your device. However, I would be looking for a setting like "SIP REINVITE" and disabling it.

Please post support questions on the forum. Do not send PMs unless requested.
martin is offline   Reply With Quote
Unread 01-16-2010, 05:22 PM   #3
Junior Member
Join Date: Jan 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
rogerhilary is on a distinguished road


Thank you for that speedy response.
I have trawled through the manula for the Linksys PAP2 (as well as its bigger brother the Sipura SPA 3000) and can find nothing to enable or disable facilities for SIP re-invites.

I then looked through this forum and it seems that others have had issues with SIP re-invites and they too have not been able to "switch them off". I see that the server which initiates the SIP re-invite is supposed to first enquire if the UA does support SIP re-invites and only if it does issue one.
On this basis something seems to be broken, either the server is not asking, the PAP2 is responding incorrectly or the server is not taking "cannot handle rre-invites" into account. I have not been able in the syslog of the SIP messages to recognise the server asking about SIP re-invites, it just seems to do it, but then again maybe I missed it.
rogerhilary is offline   Reply With Quote

one way audio, pstn access

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Free DID Numbers, Free Voip Calls, & more Voip Info amroe Voxalot General 54 01-13-2014 09:11 AM
Calling through PSTN via SIP Broker PSTN access numbers & voxalot patwolf Voxalot Support 7 02-17-2008 07:50 PM
PSTN Access numbers and my DTMF yfm SIP Broker Support 5 12-09-2007 06:51 PM
PSTN access numbers for 209 and 530 (US) Area Codes jptg5Y SIP Broker Support 0 02-25-2007 01:35 AM
New PSTN Access Numbers martin Voxalot Support 1 01-15-2007 07:48 AM

All times are GMT. The time now is 11:34 AM.

Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.