Jumble the SIP settings are given below:

SIP port : 5060
Registrar : sip.jumblo.com
Proxy server : sip.jumblo.com
Outbound proxy server : leave empty
Account name : your Jumblo username
Password : your Jumblo password
Display name/number : your Jumblo username or voipnumber
Stunserver (option) : stun.jumblo.com

Jumblo is latest voip service launched by Dellmont Sarl, the people behind actionvoip and telbo VoIP services. As of date, Jumblo is offering cheapest call rate to India mobile, which is somewhat offering the opposite of actionvoip. The call rates are

India Landline: 0.010 EUR
India Mobile: 0.007 EUR (cheapest call to India today)

Hence, jumblo is ideal for those who calls Indian mobile number frequently. As with all betamax services, you can buy credit that entitles you to 90 Freedays. This means you can call all countries in the free destinations list for 90 days at no costs. Once, the 90 days are over, you will keep your credit, and the normal rate will be charged for these destinations.