07-09-2009 10:23 PM - edited 03-15-2019 06:54 PM
We had the following connection:
IPHone--Gw--WAN--GW(PSTN)-CCM
For outgoing call from IP Phone to PSTN , the ipphone heard very good but the PSTN heard very bad. The calls is connected in g729r8.
The calls iphone--CCM--GW---WAN---GW---Ipphone is g729 and the both heard very good.
anyone can help me?
07-10-2009 02:29 AM
Did you try to use G711 with calls to PSTN?
07-10-2009 07:48 AM
Yes, I made the test and I don't work
08-18-2010 11:36 PM
How are you connected to the PSTN? PRI, CAS, E1 R2, or FXO?
When you say bad voice quality, what exactly is the symptom? Choppy audio, echo, static, etc.The following document has samples of various bad audio quality symptoms and they can help you identify exactly what are you experiencing.
http://www.cisco.com/en/US/tech/tk652/tk698/technologies_white_paper09186a00801545e4.shtml
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