On 12/06/13 11:58, Nigel Titley wrote: > Does anyone have recommendations for helpful and reliable VOIP services > providers in the UK. We're currently on a Gradwell hosted PABX solution > but it's been getting more and more unreliable and we are now starting > to get customer complaints: queued calls are being dropped before the > phones ring, phones unregister randomly and I get emails telling me > phones have unregistered when they haven't, I can't block incoming SIP > hack attempts because Gradwell can't guarantee what IP address incoming > calls will come from, they don't do IPv6 etc
Gradwell are good guys. I know they had a bit of a platform move hipcup. But I'm sure general issues can be worked through. Which phones are you using? Managed by gradwell? All up to date firmwares etc? If you have snoms, then loads of diagnostics can be done to work out whether some SIP Alg or network issue. Randomly un-registering phones could simply be your phones are set to a too short registration expiry and a too long registration retry. SIP registration can be vulnerable to losing 1 packet out of 4 in the exchange. So a failed SIP registration doesn't get retried before the original registration has expired. This is very common, and usually in the face of registration problem people seem to have this habit of setting the SIP expiry to a very low value like 60 seconds. Out of the box Snom phones have a retry interval of 5 minutes. If you set your SIP expiry to 1 minute, then a single packet lost could mean 4 minutes of no registration before it retries. I'm not going to recommend a VoIP provider because lots of them are my customers and I don't like to recommend one above another. The ITSPA members list is a good place to start http://www.itspa.org.uk/members.shtml Some people on here are more wholesale. Tim
